Divisor 19907

To determine if any number is divisible by 19907, you must apply 2 tests successively. If all of them 'pass' - that is, if your number is divisible by 17 and 1171 - then it is divisible by 19907.

The following tests must pass:

• Test if a number is divisible by 17
• The "David Spies Test" for Divisibility by 1171

Easy!