Factors / Factors of 13

Factors of 13

1, 13

13 is prime: only factor pair is (1, 13), confirmed by trial division up to √13 ≈ 3.6 turning up nothing else. 13's full pair list is (1, 13), for 2 divisors in total. 13's divisors other than 13 itself sum to just 1, 12 below 13: the common deficient case. 13 is odd, digit sum 4 for 13; none of 2-12 divide 13 evenly. 13 has 2 divisors; 12 has 6 and 14 has 4, so 12 wins here. 13 divided by its largest divisor, 1, gives 13.