# Check if a large number is divisible by 20

Given a number, the task is to check if number is divisible by 20. The input number may be large and it may not be possible to store long long int and it may be very large number then we use the string.**Examples:**

Input : 7575680 Output : Yes Input : 987985865687690 Output : No

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A number is divisible by 20 if it is divisible by 5 and 4. We can check if a number is divisible by 4 by checking if last two digits are divisible by 4. We can check for divisibility by 5 by checking last digit. Also, if the last digit of a number is zero and the second last digit is a multiple of 2 then the number is divisible by 20.

## C++

`// CPP program to check if a large number` `// is divisible by 20.` `#include <iostream>` `using` `namespace` `std;` `bool` `divisibleBy20(string num)` `{` ` ` `// Get number with last two digits` ` ` `int` `lastTwoDigits = stoi(num.substr(num.length() - 2,` ` ` `num.length() - 1));` ` ` `// Check if the number formed by last two` ` ` `// digits is divisible by 5 and 4.` ` ` `return` `((lastTwoDigits % 5 == 0) &&` ` ` `(lastTwoDigits % 4 == 0));` `}` `int` `main()` `{` ` ` `string num = ` `"63284689320"` `;` ` ` `if` `(divisibleBy20(num))` ` ` `cout << ` `"Yes"` `<< endl;` ` ` `else` ` ` `cout << ` `"No"` `<< endl;` ` ` `return` `0;` `}` |

## Java

`// Java program to check if a large n` `// number is divisible by 20.` `import` `java.io.*;` `class` `GFG {` ` ` ` ` `static` `Boolean divisibleBy20(String num)` ` ` `{` ` ` `// Get number with last two digits` ` ` `int` `lastTwoDigits = Integer.parseInt(num.substring(num.length() - ` `2` `,` ` ` `num.length() ));` ` ` ` ` `// Check if the number formed by last two` ` ` `// digits is divisible by 5 and 4.` ` ` `return` `((lastTwoDigits % ` `5` `== ` `0` `) &&` ` ` `(lastTwoDigits % ` `4` `== ` `0` `));` ` ` `}` ` ` ` ` `// Driver Program` ` ` `public` `static` `void` `main (String[] args)` ` ` `{` ` ` `String num = ` `"63284689320"` `;` ` ` `if` `(divisibleBy20(num) == ` `true` `)` ` ` `System.out.println(` `"Yes"` `);` ` ` `else` ` ` `System.out.println(` `"No"` `);` ` ` ` ` `}` `}` `// This code is contributed by Gitanjali.` |

## Python3

`# Python3 program to check if a large` `# number is divisible by 20.` `import` `math` `def` `divisibleBy20(num):` ` ` `# Get number with last two digits` ` ` `lastTwoDigits ` `=` `int` `(num[` `-` `2` `:])` ` ` `# Check if the number formed by last two` ` ` `# digits is divisible by 5 and 4.` ` ` `return` `((lastTwoDigits ` `%` `5` `=` `=` `0` `and` ` ` `lastTwoDigits ` `%` `4` `=` `=` `0` `))` `# driver code` `num ` `=` `"63284689320"` `if` `(divisibleBy20(num) ` `=` `=` `True` `):` ` ` `print` `(` `"Yes"` `)` `else` `:` ` ` `print` `(` `"No"` `)` `# This code is contributed by Gitanjali.` |

## C#

`// C# program to check if a large` `// 'n' number is divisible by 20.` `using` `System;` `using` `System.Text;` `class` `GFG` `{` `static` `bool` `divisibleBy20(String num)` `{` ` ` `// Get number with last two digits` ` ` `int` `lastTwoDigits = Int32.Parse(num.Substring(2));` ` ` ` ` `// Check if the number formed` ` ` `// by last two digits is` ` ` `// divisible by 5 and 4.` ` ` `return` `((lastTwoDigits % 5 == 0) &&` ` ` `(lastTwoDigits % 4 == 0));` `}` `// Driver Code` `static` `public` `void` `Main ()` `{` ` ` `String num = ` `"63284689320"` `;` ` ` `if` `(divisibleBy20(num) == ` `true` `)` ` ` `Console.Write(` `"Yes"` `);` ` ` `else` ` ` `Console.Write(` `"No"` `);` `}` `}` `// This code is contributed by Raj` |

## PHP

`<?php` `// PHP program to check` `// if a large number is` `// divisible by 20.` `function` `divisibleBy20(` `$num` `)` `{` ` ` `// Get number with` ` ` `// last two digits` ` ` `$lastTwoDigits` `= ` `intval` `(` `substr` `(` `$num` `,` ` ` `(` `strlen` `(` `$num` `) - 2), 2));` ` ` `// Check if the number` ` ` `// formed by last two` ` ` `// digits is divisible` ` ` `// by 5 and 4.` ` ` `return` `((` `$lastTwoDigits` `% 5 == 0) &&` ` ` `(` `$lastTwoDigits` `% 4 == 0));` `}` `// Driver Code` `$num` `= ` `"63284689320"` `;` `if` `(divisibleBy20(` `$num` `))` ` ` `echo` `"Yes"` `;` `else` ` ` `echo` `"No"` `;` `// This code is contributed by mits.` `?>` |

## Javascript

`<script>` `// Javascript program to check` `// if a large number is` `// divisible by 20.` `function` `divisibleBy20(num)` `{` ` ` `// Get number with` ` ` `// last two digits` ` ` `let lastTwoDigits = parseInt(num.slice(-2, num.length))` ` ` `console.log(num.slice(-2, 1))` ` ` `// Check if the number` ` ` `// formed by last two` ` ` `// digits is divisible` ` ` `// by 5 and 4.` ` ` `return` `((lastTwoDigits % 5 == 0) &&` ` ` `(lastTwoDigits % 4 == 0))` `}` `// Driver Code` `let num = ` `"63284689320"` `;` `if` `(divisibleBy20(num))` ` ` `document.write(` `"Yes"` `);` `else` ` ` `document.write(` `"No"` `);` `// This code is contributed by _saurabh_jaiswal.` `</script>` |

**Output:**

Yes