Two.
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1, 2, 3, 6, 9, 18.
1, 2, 3, 6, 9, 18.
Any of its factors which are: 1, 2, 3, 6, 9 and 18
A factor of 2 is a whole number that divides (or goes into) 2, without remainder. 2 is a prime, so there is no factor of 2 other than 1 and 2 itself. A multiple of 2 is any number that 2 goes into, such as 2, 4, 6, 20002 etc. The number that is both a factor and multiple of 2 is 2.
1, 2, 3, 4, 6, 12.