1 + 2 + 4 + 5 + 8 + 10 + 11 + 20 + 22 + 25 + 40 + 44 + 50 + 55 + 88 + 100 + 110 + 200 + 220 + 275 + 440 + 550 + 1100 + 2200 = 5,580
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The sum of the factors of any negative number is zero.
2,4,8,10 and 16 are factors of 400.
455
66
The factors of 49 are 1, 7, and 49. When you add them together you get 57, which is the sum.