Factors / Factors of 10

Factors of 10

1, 2, 5, 10

10 breaks into 2 pairs, tested up to √10 ≈ 3.2; each pair multiplies back to 10 exactly. 10's full pair list is (1, 10), (2, 5), for 4 divisors in total. 10's divisors other than 10 itself sum to just 8, 2 below 10: the common deficient case. 10 is even, digit sum 1 for 10; small divisors of 10 include 2, 5. 10 has 4 divisors; 9 has 3 and 11 has 2, so 10 wins here. 10 divided by its largest divisor, 5, gives 2.