Q: What is the sum of all factors of the number 511,205,720 excluding 511,205,720?

 A: 639,007,240

Why is 639,007,240 the sum of all factors of 511,205,720, excluding 511,205,720?

The factors of the number 511,205,720 are: 1, 2, 4, 5, 8, 10, 20, 40, 12780143, 25560286, 51120572, 63900715, 102241144, 127801430, 255602860, 511205720.

If you add them up, you will get the total of 511,206,359. Now subtract 511,205,720 to get 639,007,240


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