It depends what you mean by symmetric. If you mean that there are the same number of factors on each branch, then the answer is No. eg
20
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4 5
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2 2
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No you cannot. You might want to try the factor tree for 27.
Yes.
1 is the smallest natural number. 1 is the factor of every number. 1 is neither prime nor composite.
No, 1 is a factor of every whole number because 1 is a factor of every whole number.
Every number has a factor pair of 1 and itself. Prime numbers have that as their only factor pair. Composite numbers have additional factor pairs. 7 = 1 x 7 9 = 1 x 9 16 = 1 x 16 and others 21 = 1 x 21 and others