All of them. Different numbers have different numbers of factors.
Four of them.
Four: 1 5 25 125.
Its factors are: 1, 2, 4 and 8 which makes four of them
Six: 1 2 3 4 6 12.
Four
12 different numbers.
Six of them.
The limit is infinity if the factors do not have to be whole numbers. If you stipulate that the factors have to be whole numbers, then, yes, for each number, there is a limit to how many factors it has. For example, the number 4 has only 3 whole-number factors: 1, 2, and 4.
11,1,3,33
1,2,3,6,9,18,27,54
Six numbers. They are 1, 2, 4, 5, 10 and 20.