Divisor 20931

To determine if any number is divisible by 20931, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 6977 - then it is divisible by 20931.

The following tests must pass:

• Test if a number is divisible by 3
• The "Vanja Pejovic Test" for Divisibility by 6977

Easy!