Let's deny the premise. I don't think they are opposites. The opposite of a factor is a non-factor or a number that is not a factor and in special cases factors and multiples are the same. 10 is both a factor and a multiple of 10.
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Factors of the number will also be factors of the number's multiples. Multiples of the number will also be multiples of the number's factors.
Factors go into numbers, numbers go into multiples.
Factors go into numbers, numbers go into multiples.
Factors - 1, 2, 3, 15, 30 Multiples 0, 30, 60, 90, 120, 150...
the factors of 1millon up to 26 are 1,2,4,5,8,10,16,20,25