The factors of 18 are 1, 2, 3, 6, 9, and 18
The factors of 20 are 1, 2, 4, 5, 10, and 20
The factors of 27 are 1, 3, 9, and 27
The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42
The factors of 45 are 1, 3, 5, 9, 15, and 45
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