Factors / Factors of 99

Factors of 99

1, 3, 9, 11, 33, 99

99 breaks into 3 pairs, tested up to √99 ≈ 9.9; each pair multiplies back to 99 exactly. 99's full pair list is (1, 99), (3, 33), (9, 11), for 6 divisors in total. 99's divisors other than 99 itself sum to just 57, 42 below 99: the common deficient case. 99 is odd, digit sum 18 for 99; small divisors of 99 include 3, 9, 11. 99 has 6 divisors; 98 has 6 and 100 has 9, so 100 wins here. 99 divided by its largest divisor, 33, gives 3.