Q: What is the sum of all factors of the number 399,880 excluding 399,880?
A: 570,320
The factors of the number 399,880 are: 1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520, 769, 1538, 3076, 3845, 6152, 7690, 9997, 15380, 19994, 30760, 39988, 49985, 79976, 99970, 199940, 399880.
If you add them up, you will get the total of 400,450. Now subtract 399,880 to get 570,320