Factors / Factors of 55

Factors of 55

1, 5, 11, 55

55 breaks into 2 pairs, tested up to √55 ≈ 7.4; each pair multiplies back to 55 exactly. 55's full pair list is (1, 55), (5, 11), for 4 divisors in total. 55's divisors other than 55 itself sum to just 17, 38 below 55: the common deficient case. 55 is odd, digit sum 10 for 55; small divisors of 55 include 5, 11. 55 has 4 divisors; 54 has 8 and 56 has 8, so 54 wins here. 55 divided by its largest divisor, 11, gives 5.