Q: What is the sum of all factors of the number 397,760 excluding 397,760?

A: 644,656

Why is 644,656 the sum of all factors of 397,760, excluding 397,760?

The factors of the number 397,760 are: 1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 32, 40, 44, 55, 64, 80, 88, 110, 113, 160, 176, 220, 226, 320, 352, 440, 452, 565, 704, 880, 904, 1130, 1243, 1760, 1808, 2260, 2486, 3520, 3616, 4520, 4972, 6215, 7232, 9040, 9944, 12430, 18080, 19888, 24860, 36160, 39776, 49720, 79552, 99440, 198880, 397760.

If you add them up, you will get the total of 398,404. Now subtract 397,760 to get 644,656