Divisor 20831

To determine if any number is divisible by 20831, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 37 and 563 - then it is divisible by 20831.

The following tests must pass:

• Test if a number is divisible by 37
• Test if a number is divisible by 563

Easy!