20 and 1
10, 5, 4 and 2
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The number four.
Pairs of numbers whose sum is -14 and that are factors of -189 include -7 and -7, and -21 and 7.
The factors of 21 are:1, 3, 7, 21The factors of 350 are:1, 2, 5, 7, 10, 14, 25, 35, 50, 70, 175, 350The common factors are:1, 7
The sum of the factors of any negative number is zero.
the factors of 126 are: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, and 126, so it has 12 factors