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factors of 13

13 1, 13 -1, -13

14 1, 2, 7, 14 -1, -2, -7, -14

15 1, 3, 5, 15 -1, -3, -5, -15

16 1, 2, 4, 8, 16 -1, -2, -4, -8, -16

17 1, 17 -1, -17

18 1, 2, 3, 6, 9, 18 -1, -2, -3, -6, -9, -18

19 1, 19 -1, -19

20 1, 2, 4, 5, 10, 20 -1, -2, -4, -5, -10, -20

21 1, 3, 7, 21 -1, -3, -7, -21

22 1, 2, 11, 22 -1, -2, -11, -22