Q: What is the sum of all factors of the number 6,420 including 6,420?
A: 18,144
The factors of the number 6,420 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 107, 214, 321, 428, 535, 642, 1070, 1284, 1605, 2140, 3210, 6420.
If you add them up, you will get the total of 18,144.