1 3 9 11 33 and 99.
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The number 99 can be divided evenly by 1, 3, 9, 11, 33, and 99. These numbers are factors of 99 because they divide evenly into it without leaving a remainder. Additionally, 99 is a composite number because it has more than two factors.
It is 1
1, 2, 4, 5, 10, and 20 divide evenly into 20.
1 and 13
5 & 17