20564339 has 8 divisors (see below), whose sum is σ = 21814128. Its totient is φ = 19319040.

The previous prime is 20564321. The next prime is 20564359. The reversal of 20564339 is 93346502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20564339 - 2²⁴ = 3787123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20564359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15284 + ... + 16574.

It is an arithmetic number, because the mean of its divisors is an integer number (2726766).

Almost surely, 2^20564339 is an apocalyptic number.

20564339 is a deficient number, since it is larger than the sum of its proper divisors (1249789).

20564339 is a wasteful number, since it uses less digits than its factorization.

20564339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 20564339 is about 4534.7920569746. The cubic root of 20564339 is about 273.9712039285.

The spelling of 20564339 in words is "twenty million, five hundred sixty-four thousand, three hundred thirty-nine".