The factor pairs of 20 are: 20,1 / 10,2 / 5,4
Chat with our AI personalities
(20,1)(10,2)(5,4)
The difference is between factor pairs and distinct factors. With square numbers, one of the factor pairs will be the same number twice. When listing the distinct factors, that number is only listed once.
(63,1)(21,3)(9,7)
(20,1)(10,2)(5,4) (30,1)(15,2)(10,3)(6,5) (36,1)(18,2)(12,3)(9,4)(6,6)
It's not, because all the factors of 20 aren't prime.