Q: What is the sum of all factors of the number 123,240 excluding 123,240?

A: 279,960

Why is 279,960 the sum of all factors of 123,240, excluding 123,240?

The factors of the number 123,240 are: 1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 20, 24, 26, 30, 39, 40, 52, 60, 65, 78, 79, 104, 120, 130, 156, 158, 195, 237, 260, 312, 316, 390, 395, 474, 520, 632, 780, 790, 948, 1027, 1185, 1560, 1580, 1896, 2054, 2370, 3081, 3160, 4108, 4740, 5135, 6162, 8216, 9480, 10270, 12324, 15405, 20540, 24648, 30810, 41080, 61620, 123240.

If you add them up, you will get the total of 123,519. Now subtract 123,240 to get 279,960