2
1 and 2.
Six
20 has six factors.
The first four common multiples of 4 and 7 are 28, 56, 84, and 102
Four factors in common.
The common factors of six and eight are: 1, 2
The common factors are: 1, 2, 3, 6.
Four, four, six, three, six and two factors respectively.
The common factors are: 1, 2
32 has six factors. 33 has four factors.
Four common factors.