520 = 2 x 2 x 2 x 5 x 13
OR
2^3 x 5 x 13
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Factor Tree of 520: ........520 ......../ \ ....104 5 ...../ \ ...4..26 ../\.. /\ 2 2 2 13
The greatest common factor of 198 and 520 is 2.
The GCF is 5.
35 can be a factor, but it is not prime.
1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 260, 520