Q: What is the sum of all factors of the number 870,520 excluding 870,520?

Why is 1,368,680 the sum of all factors of 870,520, excluding 870,520?

The factors of the number 870,520 are: 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 3109, 6218, 12436, 15545, 21763, 24872, 31090, 43526, 62180, 87052, 108815, 124360, 174104, 217630, 435260, 870520.

If you add them up, you will get the total of 870,521. Now subtract 870,520 to get 1,368,680

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