Yes. Any number is both a multiple and a factor of itself.
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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.
The highest is infinity, because numbers go on for ever. The highest common factor is 6 and lowest common multiple is 60.
1 is a factor of 4 that is not a multiple of 2.
16 is both a factor and a multiple of itself.
10 is both a factor and a multiple of itself.