Four, four, six, three, six and two factors respectively.
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The factors of 57 are 1, 3, 19, and 57The factors of 18 are 1, 2, 3, 6, 9, and 18
The only number less than 100 with exactly nine factors is 36. 19 is not one of the factors.
1 and 2
Two factors.
The factors of 54 are: 1, 2, 3, 6, 9, 18, 27, 54 The factors of 90 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 The factors of 126 are: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126 The Greatest Common Factor: GCF = 18