Factors / Factors of 4

Factors of 4

1, 2, 4

4 is a perfect square (2² = 4); that gives 4 an odd 3-divisor count, since only 2 pairs with itself. 4's full pair list is (1, 4), (2, 2), for 3 divisors in total. 4's divisors other than 4 itself sum to just 3, 1 below 4: the common deficient case. 4 is even, digit sum 4 for 4; small divisors of 4 include 2. 4 has 3 divisors; 3 has 2 and 5 has 2, so 4 wins here. 4 divided by its largest divisor, 2, gives 2.