Q: What is the sum of all factors of the number 639,390 excluding 639,390?
A: 895,218
The factors of the number 639,390 are: 1, 2, 3, 5, 6, 10, 15, 30, 21313, 42626, 63939, 106565, 127878, 213130, 319695, 639390.
If you add them up, you will get the total of 640,285. Now subtract 639,390 to get 895,218