Q: What is the sum of all factors of the number 81,655,665 excluding 81,655,665?

A: 80,570,511

Why is 80,570,511 the sum of all factors of 81,655,665, excluding 81,655,665?

The factors of the number 81,655,665 are: 1, 3, 5, 7, 13, 15, 21, 35, 39, 65, 91, 105, 163, 195, 273, 367, 455, 489, 815, 1101, 1141, 1365, 1835, 2119, 2445, 2569, 3423, 4771, 5505, 5705, 6357, 7707, 10595, 12845, 14313, 14833, 17115, 23855, 31785, 33397, 38535, 44499, 59821, 71565, 74165, 100191, 166985, 179463, 222495, 299105, 418747, 500955, 777673, 897315, 1256241, 2093735, 2333019, 3888365, 5443711, 6281205, 11665095, 16331133, 27218555, 81655665.

If you add them up, you will get the total of 81,655,745. Now subtract 81,655,665 to get 80,570,511