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Verified Answer :

720 = 2^4 3² 5
does this help 

Prime factors are natural numbers that has no divisors except 1 and itself as 2,3,5,7 and many many more
so, you need to use this numbers to do a prime factorization.
So, the prime factorization of 720 is 2^4 3^2 5
Hope this Helps :D