Q: What is the sum of all factors of the number 257,920 excluding 257,920?

A: 427,520

Why is 427,520 the sum of all factors of 257,920, excluding 257,920?

The factors of the number 257,920 are: 1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 31, 32, 40, 52, 62, 64, 65, 80, 104, 124, 128, 130, 155, 160, 208, 248, 260, 310, 320, 403, 416, 496, 520, 620, 640, 806, 832, 992, 1040, 1240, 1612, 1664, 1984, 2015, 2080, 2480, 3224, 3968, 4030, 4160, 4960, 6448, 8060, 8320, 9920, 12896, 16120, 19840, 25792, 32240, 51584, 64480, 128960, 257920.

If you add them up, you will get the total of 258,347. Now subtract 257,920 to get 427,520