20716568 has 16 divisors (see below), whose sum is σ = 38942160. Its totient is φ = 10332000.

The previous prime is 20716561. The next prime is 20716573. The reversal of 20716568 is 86561702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293 + ... + 6443.

It is an arithmetic number, because the mean of its divisors is an integer number (2433885).

Almost surely, 2^20716568 is an apocalyptic number.

It is an amenable number.

20716568 is a deficient number, since it is larger than the sum of its proper divisors (18225592).

20716568 is a wasteful number, since it uses less digits than its factorization.

20716568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6578 (or 6574 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 20716568 is about 4551.5456715274. The cubic root of 20716568 is about 274.6455731542.

The spelling of 20716568 in words is "twenty million, seven hundred sixteen thousand, five hundred sixty-eight".