Q: What is the sum of all factors of the number 123,840 excluding 123,840?

A: 312,024

Why is 312,024 the sum of all factors of 123,840, excluding 123,840?

The factors of the number 123,840 are: 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 24, 30, 32, 36, 40, 43, 45, 48, 60, 64, 72, 80, 86, 90, 96, 120, 129, 144, 160, 172, 180, 192, 215, 240, 258, 288, 320, 344, 360, 387, 430, 480, 516, 576, 645, 688, 720, 774, 860, 960, 1032, 1290, 1376, 1440, 1548, 1720, 1935, 2064, 2580, 2752, 2880, 3096, 3440, 3870, 4128, 5160, 6192, 6880, 7740, 8256, 10320, 12384, 13760, 15480, 20640, 24768, 30960, 41280, 61920, 123840.

If you add them up, you will get the total of 124,152. Now subtract 123,840 to get 312,024