20564535 has 16 divisors (see below), whose sum is σ = 33669504. Its totient is φ = 10712352.

The previous prime is 20564513. The next prime is 20564561. The reversal of 20564535 is 53546502.

It is not a de Polignac number, because 20564535 - 2⁸ = 20564279 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15297 + ... + 16586.

It is an arithmetic number, because the mean of its divisors is an integer number (2104344).

Almost surely, 2^20564535 is an apocalyptic number.

20564535 is a deficient number, since it is larger than the sum of its proper divisors (13104969).

20564535 is a wasteful number, since it uses less digits than its factorization.

20564535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31934.

The product of its (nonzero) digits is 18000, while the sum is 30.

The square root of 20564535 is about 4534.8136676163. The cubic root of 20564535 is about 273.9720743380.

The spelling of 20564535 in words is "twenty million, five hundred sixty-four thousand, five hundred thirty-five".