Divisor 20671

To determine if any number is divisible by 20671, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 7 and 2953 - then it is divisible by 20671.

The following tests must pass:

• Test if a number is divisible by 7
• The "Tiago Skora Test" for Divisibility by 2953

Easy!