1, 2, 4, 5, 10, 20
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It's not, because all the factors of 20 aren't prime.
40 has 8 factors: 1 2 4 5 8 10 20 40.
The factors of 200 are: 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100 and 200.
(20,1)(10,2)(5,4) (30,1)(15,2)(10,3)(6,5) (36,1)(18,2)(12,3)(9,4)(6,6)