There are infinetly many numbers which have 2 and 5 as their factors.
Some examples are 10, 20, 30, 40, etc.
2 and 5 both are prime numbers and their common multiples are the multiples of 2 x 5 = 10. So all the multiples of 10 have 2 and 5 as their factors.
However if consider 2 and 5 as the only two proper factors, then the required number is 10.
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The prime factors are: 2 x 2 x 5
The prime factors of 10 are: 2 and 5.
The prime factors for 20 are: 2 . 2 . 5 . 5
The prime factors of 200 are 2 and 5 As a product of its prime factors: 2*2*2*5*5 = 200
The factors of 15 are: 1, 3, 5, and 15.The prime factors of 15 are: 3 and 5.The factors of 20 are: 1, 2, 4, 5, 10, and 20.The prime factors of 20 are: 2 and 5.