Divisor 20613

To determine if any number is divisible by 20613, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 6871 - then it is divisible by 20613.

The following tests must pass:

• Test if a number is divisible by 3
• The "Izaak Lauer Test" for Divisibility by 6871

Easy!