Divisor 20711

To determine if any number is divisible by 20711, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 139 and 149 - then it is divisible by 20711.

The following tests must pass:

• Test if a number is divisible by 139
• Test if a number is divisible by 149

Easy!