171
57, 3
19, 3, 3
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factor tree of 216
The least common factor of any set of numbers is 1.
The prime factor tree of 280 is:140,270,2,235,2,2,27,5,2,2,2
Factor Tree of 20: ........20 ......../ \ .......4 5 ....../ \ .....2 2
A tree.