Q: What is the sum of all factors of the number 1,293,560 excluding 1,293,560?

Why is 1,663,480 the sum of all factors of 1,293,560, excluding 1,293,560?

The factors of the number 1,293,560 are: 1, 2, 4, 5, 8, 10, 20, 40, 73, 146, 292, 365, 443, 584, 730, 886, 1460, 1772, 2215, 2920, 3544, 4430, 8860, 17720, 32339, 64678, 129356, 161695, 258712, 323390, 646780, 1293560.

If you add them up, you will get the total of 1,293,561. Now subtract 1,293,560 to get 1,663,480

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