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15 is an odd two-digits composite number following 14 and preceding 16. In scientific notation, it is written as 1.5 × 10 1. The sum of its digits is 6. It has a total of 2 prime factors and 4 positive divisors. There are 8 positive integers (up to 15) that are relatively prime to 15. Properties Name Notation Prime Factorization Divisors
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