1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, and 400
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they are 1,19
There are no factors other than 1 and 13 that go into 13, as it is a prime number.
1,2,3,4,6,8,12,24
3 and 107
400 is a significant number because it is a square number as 20*20 = 400