Q: What is the sum of all factors of the number 420,021 excluding 420,021?
A: 291,339
The factors of the number 420,021 are: 1, 3, 7, 9, 21, 59, 63, 113, 177, 339, 413, 531, 791, 1017, 1239, 2373, 3717, 6667, 7119, 20001, 46669, 60003, 140007, 420021.
If you add them up, you will get the total of 420,312. Now subtract 420,021 to get 291,339