1 and 16
2 and 8
4 and 4
2,4,8 (1 and 16 are divisors too, but the number and 1 are always divisors)
The divisors of 32 are: 1, 2, 4, 8, 16, 32.
The divisors of 64 are: 1 2 4 8 16 32 64.
64 has seven divisors: 1, 2, 4, 8, 16, 32, 64.
16 by 2,4 by 8.
The divisors of 16 are 2, 4 and 8. The divisors of 24 are 2, 3, 4, 8 and 12. Hence the GCD is 8.
The divisors of 16 are 2, 4 and 8. The divisors of 24 are 2, 3, 4, 8 and 12. Hence the GCD is 8.
32 has six divisors (factors): 1, 2, 4, 8, 16, 32.
64 has 7 divisors: 1 2 4 8 16 32 64.
The divisors of 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80.
These are all the divisors of 64: 1, 2, 4, 8, 16, 32, 64.
80 has 10 divisors: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80.