20927408565 has 32 divisors (see below), whose sum is σ = 38646164736. Its totient is φ = 9472089600.

The previous prime is 20927408539. The next prime is 20927408597. The reversal of 20927408565 is 56580472902.

It is not a de Polignac number, because 20927408565 - 2⁹ = 20927408053 is a prime.

It is a Smith number, since the sum of its digits (48) 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 976072 + ... + 997281.

It is an arithmetic number, because the mean of its divisors is an integer number (1207692648).

Almost surely, 2^20927408565 is an apocalyptic number.

It is an amenable number.

20927408565 is a deficient number, since it is larger than the sum of its proper divisors (17718756171).

20927408565 is a wasteful number, since it uses less digits than its factorization.

20927408565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973469.

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 20927408565 in words is "twenty billion, nine hundred twenty-seven million, four hundred eight thousand, five hundred sixty-five".