Factors / Factors of 505

Factors of 505

1, 5, 101, 505

505 breaks into 2 pairs, tested up to √505 ≈ 22.5; each pair multiplies back to 505 exactly. 505's full pair list is (1, 505), (5, 101), for 4 divisors in total. 505's divisors other than 505 itself sum to just 107, 398 below 505: the common deficient case. 505 is odd, digit sum 10 for 505; small divisors of 505 include 5. 505 has 4 divisors; 504 has 24 and 506 has 8, so 504 wins here. 505 divided by its largest divisor, 101, gives 5.