20865568 has 24 divisors (see below), whose sum is σ = 41383440. Its totient is φ = 10355520.

The previous prime is 20865557. The next prime is 20865583. The reversal of 20865568 is 86556802.

It is a self number, because there is not a number n which added to its sum of digits gives 20865568.

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, 2103 + ... + 6793.

It is an arithmetic number, because the mean of its divisors is an integer number (1724310).

Almost surely, 2^20865568 is an apocalyptic number.

It is an amenable number.

20865568 is a deficient number, since it is larger than the sum of its proper divisors (20517872).

20865568 is a wasteful number, since it uses less digits than its factorization.

20865568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4840 (or 4832 counting only the distinct ones).

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

The square root of 20865568 is about 4567.8844118476. The cubic root of 20865568 is about 275.3024463095.

The spelling of 20865568 in words is "twenty million, eight hundred sixty-five thousand, five hundred sixty-eight".