Factors / Factors of 19

Factors of 19

1, 19

19 is prime: only factor pair is (1, 19), confirmed by trial division up to √19 ≈ 4.4 turning up nothing else. 19's full pair list is (1, 19), for 2 divisors in total. 19's divisors other than 19 itself sum to just 1, 18 below 19: the common deficient case. 19 is odd, digit sum 10 for 19; none of 2-12 divide 19 evenly. 19 has 2 divisors; 18 has 6 and 20 has 6, so 18 wins here. 19 divided by its largest divisor, 1, gives 19.