Anything that isn't 1, 2, 3, 6, 9 or 18.
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Not a factor of 18 ?
18. All numbers' highest factor is the number itself.
The number 8 is the factor of 18. But 8 is not a multiple of 6.
All factors of 18 are factors of 36, because 18 itself is a factor of 36.
18 = 2 * 3 * 3