Factors / Factors of 217

Factors of 217

1, 7, 31, 217

217 breaks into 2 pairs, tested up to √217 ≈ 14.7; each pair multiplies back to 217 exactly. 217's full pair list is (1, 217), (7, 31), for 4 divisors in total. 217's divisors other than 217 itself sum to just 39, 178 below 217: the common deficient case. 217 is odd, digit sum 10 for 217; small divisors of 217 include 7. 217 has 4 divisors; 216 has 16 and 218 has 4, so 216 wins here. 217 divided by its largest divisor, 31, gives 7.