12 = 1 , 2, 3, 4, 6, 12
13 = 1, 13
20 = 1, 2, 4, 5, 10, 20
45 = 1, 3, 5, 9, 15, 45
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12 = 1 , 2, 3, 4, 6, 12
13 = 1, 13
20 = 1, 2, 4, 5, 10, 20
45 = 1, 3, 5, 9, 15, 45