Q: What is the sum of all factors of the number 289,920 excluding 289,920?

A: 640,320

Why is 640,320 the sum of all factors of 289,920, excluding 289,920?

The factors of the number 289,920 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 64, 80, 96, 120, 128, 151, 160, 192, 240, 302, 320, 384, 453, 480, 604, 640, 755, 906, 960, 1208, 1510, 1812, 1920, 2265, 2416, 3020, 3624, 4530, 4832, 6040, 7248, 9060, 9664, 12080, 14496, 18120, 19328, 24160, 28992, 36240, 48320, 57984, 72480, 96640, 144960, 289920.

If you add them up, you will get the total of 290,560. Now subtract 289,920 to get 640,320