Divisor 20841

To determine if any number is divisible by 20841, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 3 and 6947 - then it is divisible by 20841.

The following tests must pass:

• Test if a number is divisible by 3
• The "David Kling Test" for Divisibility by 6947

Easy!