Q: What is the sum of all factors of the number 639,220 excluding 639,220?
A: 747,788
The factors of the number 639,220 are: 1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620, 1031, 2062, 4124, 5155, 10310, 20620, 31961, 63922, 127844, 159805, 319610, 639220.
If you add them up, you will get the total of 639,967. Now subtract 639,220 to get 747,788