20564051 has 4 divisors (see below), whose sum is σ = 21001632. Its totient is φ = 20126472.

The previous prime is 20564041. The next prime is 20564059. The reversal of 20564051 is 15046502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20564051 - 2¹⁰ = 20563027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20564059) 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, 218720 + ... + 218813.

It is an arithmetic number, because the mean of its divisors is an integer number (5250408).

Almost surely, 2^20564051 is an apocalyptic number.

20564051 is a deficient number, since it is larger than the sum of its proper divisors (437581).

20564051 is an equidigital number, since it uses as much as digits as its factorization.

20564051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437580.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 20564051 is about 4534.7603023754. The cubic root of 20564051 is about 273.9699249495.

The spelling of 20564051 in words is "twenty million, five hundred sixty-four thousand, fifty-one".