Q: What is the sum of all factors of the number 821,080 excluding 821,080?

Why is 1,169,720 the sum of all factors of 821,080, excluding 821,080?

The factors of the number 821,080 are: 1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 1579, 3158, 6316, 7895, 12632, 15790, 20527, 31580, 41054, 63160, 82108, 102635, 164216, 205270, 410540, 821080.

If you add them up, you will get the total of 821,081. Now subtract 821,080 to get 1,169,720

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