The only common factor is one.
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1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 315, -1, -3, -5, -7, -9, -15, -21, -35, -45, -63, -105, -315
1, 2.
The LCM of both numbers is 96
The numbers that go into 63 are 1, 3, 7, 9, 21, and 63. The numbers that go into 20 are 1, 2, 4, 5, 10, and 20.
53 and 2 are both prime numbers and their LCM is 106