20564927 has 4 divisors (see below), whose sum is σ = 20585760. Its totient is φ = 20544096.

The previous prime is 20564923. The next prime is 20564941. The reversal of 20564927 is 72946502.

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 20564927 - 2² = 20564923 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20564923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8858 + ... + 10935.

It is an arithmetic number, because the mean of its divisors is an integer number (5146440).

Almost surely, 2^20564927 is an apocalyptic number.

20564927 is a deficient number, since it is larger than the sum of its proper divisors (20833).

20564927 is a wasteful number, since it uses less digits than its factorization.

20564927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20832.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 20564927 is about 4534.8568885909. The cubic root of 20564927 is about 273.9738151403.

The spelling of 20564927 in words is "twenty million, five hundred sixty-four thousand, nine hundred twenty-seven".