Any multiple of 20 has these factors. So, 20, 40, 60... and so on.
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20 and 40 have 4 and 5 as common factors.
As a product of its prime factors: 3*5*5*5 = 375
As a product of its prime factors: 3*3*5*5 = 225
The factors of 60 are 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60. The prime numbers are 2, 3, and 5.
5 is a prime number having 1 and 5 as its only factors. It makes no difference to the factors of 5 if the digit 5 is in composite numbers.