Q: What is the sum of all factors of the number 17,780 excluding 17,780?

A: 25,228

Why is 25,228 the sum of all factors of 17,780, excluding 17,780?

The factors of the number 17,780 are: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 127, 140, 254, 508, 635, 889, 1270, 1778, 2540, 3556, 4445, 8890, 17780.

If you add them up, you will get the total of 17,805. Now subtract 17,780 to get 25,228

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