2+5+11= 18.
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The only two prime factors of 18 are: 2, 3
21
The prime factors of 18 are 2, 3, and 3. When multiplied together, 2 x 3 x 3 equals 18. These are the three prime numbers that multiply to give 18.
There are only two and they are 3 and 2.
Three. 11, 13 and 17