20565688 has 32 divisors (see below), whose sum is σ = 45304560. Its totient is φ = 8628480.

The previous prime is 20565667. The next prime is 20565691. The reversal of 20565688 is 88656502.

It is a self number, because there is not a number n which added to its sum of digits gives 20565688.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7845 + ... + 10132.

Almost surely, 2^20565688 is an apocalyptic number.

It is an amenable number.

20565688 is an abundant number, since it is smaller than the sum of its proper divisors (24738872).

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

20565688 is a wasteful number, since it uses less digits than its factorization.

20565688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18007 (or 18003 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 20565688 is about 4534.9407934393. The cubic root of 20565688 is about 273.9771945429.

It can be divided in two parts, 2056 and 5688, that added together give a square (7744 = 88²).

The spelling of 20565688 in words is "twenty million, five hundred sixty-five thousand, six hundred eighty-eight".