Divisor 20311

To determine if any number is divisible by 20311, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 19 and 1069 - then it is divisible by 20311.

The following tests must pass:

• Test if a number is divisible by 19
• The "Lee Marlow Test" for Divisibility by 1069

Easy!