Three sets
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No. Complex numbers is the highest set of numbers you can go, and there are no sets outside of complex numbers.
There are infinitely many whole numbers which are less than 20. Start with 19 and go back, beyond 0, to negative infinity.
1, 2, 4, 5, and 10 can go into 20.
A single number, 20, does not have a lowest common multiple! So there are no two numbers to go in.
1, 2, 4, 5, 10, 20, 25, 50, 100.