Q: What is the sum of all factors of the number 638,420 excluding 638,420?
A: 717,844
The factors of the number 638,420 are: 1, 2, 4, 5, 10, 20, 137, 233, 274, 466, 548, 685, 932, 1165, 1370, 2330, 2740, 4660, 31921, 63842, 127684, 159605, 319210, 638420.
If you add them up, you will get the total of 639,137. Now subtract 638,420 to get 717,844