Divisor 20519

To determine if any number is divisible by 20519, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 289 and 71 - then it is divisible by 20519.

The following tests must pass:

• Test if a number is divisible by 289
• Test if a number is divisible by 71

Easy!