The factors of 90 are all the numbers that can divide 90 without leaving a remainder. 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, and 90 are the factors of 90. i.e. F90 = {1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90}.

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