20331688 has 16 divisors (see below), whose sum is σ = 41054580. Its totient is φ = 9383808.

The previous prime is 20331679. The next prime is 20331721. The reversal of 20331688 is 88613302.

It can be written as a sum of positive squares in 2 ways, for example, as 17156164 + 3175524 = 4142^2 + 1782^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97645 + ... + 97852.

Almost surely, 2^20331688 is an apocalyptic number.

It is an amenable number.

20331688 is an abundant number, since it is smaller than the sum of its proper divisors (20722892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20331688 is a wasteful number, since it uses less digits than its factorization.

20331688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195516 (or 195512 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20331688 is about 4509.0673093224. The cubic root of 20331688 is about 272.9341081745.

It can be divided in two parts, 2033 and 1688, that added together give a square (3721 = 61²).

The spelling of 20331688 in words is "twenty million, three hundred thirty-one thousand, six hundred eighty-eight".