420 has four prime factors. Prime factors don't usually travel in pairs.
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There are 82 prime numbers between 1 and 420.
420=2x2x3x5x7
420 has four prime factors: 2,3,5,7
420 has four prime factors: 2 3 5 7.
420 = 2 x 2 x 3 x 5 x 7