420 = 2 * 2 * 3 * 5 * 7
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It is: 2*2*3*5*7 = 420 or as 22*3*5*7 = 420
22 x 3 x 5 x 7 = 420
Least Common Multiple (LCM) for 42 140 is 420.
No, 3x5x4 is not a prime factorization of 60. A prime factorization of 60 would consist of only prime numbers. The prime factorization of 60 is 2x2x3x5.
When all the factors are prime numbers, that's a prime factorization.