There are Two factor trees for 20
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It depends on the number it is compared to. 20 is a multiple of 10. 20 is a factor of 40. 20 is both a factor and a multiple of itself. 20 is neither a multiple nor a factor of 27.
Factor Tree of 20: ........20 ......../ \ .......4 5 ....../ \ .....2 2
Since 5 is a factor of 20, all the factors of 5 are common to 20.
A common factor is a factor both numbers can be evenly divided by.In this case it is 20.20/20 = 180/20 = 4