Q: What is the sum of all factors of the number 397,920 excluding 397,920?

A: 857,040

Why is 857,040 the sum of all factors of 397,920, excluding 397,920?

The factors of the number 397,920 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 48, 60, 80, 96, 120, 160, 240, 480, 829, 1658, 2487, 3316, 4145, 4974, 6632, 8290, 9948, 12435, 13264, 16580, 19896, 24870, 26528, 33160, 39792, 49740, 66320, 79584, 99480, 132640, 198960, 397920.

If you add them up, you will get the total of 398,777. Now subtract 397,920 to get 857,040