Q: What is the sum of all factors of the number 639,820 including 639,820?
A: 1,343,664
The factors of the number 639,820 are: 1, 2, 4, 5, 10, 20, 31991, 63982, 127964, 159955, 319910, 639820.
If you add them up, you will get the total of 1,343,664.