20564923 has 2 divisors, whose sum is σ = 20564924. Its totient is φ = 20564922.

The previous prime is 20564909. The next prime is 20564941. The reversal of 20564923 is 32946502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20564923 - 2⁵ = 20564891 is a prime.

It is not a weakly prime, because it can be changed into another prime (20564123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10282461 + 10282462.

It is an arithmetic number, because the mean of its divisors is an integer number (10282462).

Almost surely, 2^20564923 is an apocalyptic number.

20564923 is a deficient number, since it is larger than the sum of its proper divisors (1).

20564923 is an equidigital number, since it uses as much as digits as its factorization.

20564923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 20564923 is about 4534.8564475626. The cubic root of 20564923 is about 273.9737973771.

The spelling of 20564923 in words is "twenty million, five hundred sixty-four thousand, nine hundred twenty-three".