120 = 2³ × 3 × 5
to obtain prime factors
120 ÷ 2 = 60
60 ÷ 2 = 30
30 ÷ 2 = 15
15 ÷ 3 = 5
5 ÷ 5 = 1
prime factors are 2³ × 3 × 5
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