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If an integer is not unreasonably large, the Nifty Factor-Finding System (patent pending) is a great way to list out all of the integer's positive factors. For example, let's say we want to find all of the positive factors of $60$. You start by saying $1 \times 60 =60$ and make the gap between the two multiplied numbers smaller and smaller until you find all of them (see below):
$$1 \times 60$$
$$2 \times 30$$
$$3 \times 20$$
$$4 \times 15$$
$$5 \times 12$$
$$6 \times 10$$
And we found all of them! Pretty nifty.