Divisor 20863

To determine if any number is divisible by 20863, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 31 and 673 - then it is divisible by 20863.

The following tests must pass:

• Test if a number is divisible by 31
• Test if a number is divisible by 673

Easy!