Divisor 19909

To determine if any number is divisible by 19909, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 43 and 463 - then it is divisible by 19909.

The following tests must pass:

• Test if a number is divisible by 43
• Test if a number is divisible by 463

Easy!