20564500045 has 4 divisors (see below), whose sum is σ = 24677400060. Its totient is φ = 16451600032.

The previous prime is 20564500027. The next prime is 20564500057. The reversal of 20564500045 is 54000546502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16067590564 + 4496909481 = 126758^2 + 67059^2 .

It is a cyclic number.

It is not a de Polignac number, because 20564500045 - 2⁹ = 20564499533 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2056450000 + ... + 2056450009.

It is an arithmetic number, because the mean of its divisors is an integer number (6169350015).

Almost surely, 2^20564500045 is an apocalyptic number.

It is an amenable number.

20564500045 is a deficient number, since it is larger than the sum of its proper divisors (4112900015).

20564500045 is an equidigital number, since it uses as much as digits as its factorization.

20564500045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4112900014.

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 20564500045 in words is "twenty billion, five hundred sixty-four million, five hundred thousand, forty-five".