91
13,7
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As a product of its prime factors in exponents it is: 26*34 = 5184
The prime factorization of 400 is 2x2x2x2x5x5 (or 24 x 52 in exponential form).
820 = 22 x 5 x 41
91 7,13 7 x 13 = 91
The prime factors of 91 are: 7, 13