1, 2, 3, 4, 6, 12
1, 2, 3, 6, 9, 18
6 each. 12 total.
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The only number less than 100 with exactly nine factors is 36. 19 is not one of the factors.
Theoretically, infinity has an infinite number of factors.
The factors of 15 are 1, 3, 5, and 15.The factors of 18 are 1, 2, 3, 6, 9, and 18.The factors of 12 are 1, 2, 3, 4, 6, and 12.The common factors of 15, 18, and 12 are 1 and 3 .
Common factors of 12, 15, and 18 are: 1 and 3.
4, 6, 8, 9, 12, 18, 24, 36, 72