Q: What is the sum of all factors of the number 639,906 excluding 639,906?
A: 695,838
The factors of the number 639,906 are: 1, 2, 3, 6, 23, 46, 69, 138, 4637, 9274, 13911, 27822, 106651, 213302, 319953, 639906.
If you add them up, you will get the total of 640,601. Now subtract 639,906 to get 695,838