Factors / Factors of 2

Factors of 2

1, 2

2 is prime: only factor pair is (1, 2), confirmed by trial division up to √2 ≈ 1.4 turning up nothing else. 2's full pair list is (1, 2), for 2 divisors in total. 2's divisors other than 2 itself sum to just 1, 1 below 2: the common deficient case. 2 is even, digit sum 2 for 2; none of 2-12 divide 2 evenly. 2 has 2 divisors; 1 has 1 and 3 has 2, so 2 wins here. 2 divided by its largest divisor, 1, gives 2.