Q: What is the sum of all factors of the number 639,040 excluding 639,040?
A: 883,436
The factors of the number 639,040 are: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320, 1997, 3994, 7988, 9985, 15976, 19970, 31952, 39940, 63904, 79880, 127808, 159760, 319520, 639040.
If you add them up, you will get the total of 639,923. Now subtract 639,040 to get 883,436