20565204008 has 16 divisors (see below), whose sum is σ = 38661504000. Its totient is φ = 10255469616.

The previous prime is 20565203999. The next prime is 20565204013. The reversal of 20565204008 is 80040256502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3388328 + ... + 3394391.

It is an arithmetic number, because the mean of its divisors is an integer number (2416344000).

Almost surely, 2^20565204008 is an apocalyptic number.

It is an amenable number.

20565204008 is a deficient number, since it is larger than the sum of its proper divisors (18096299992).

20565204008 is a wasteful number, since it uses less digits than its factorization.

20565204008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6783104 (or 6783100 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The spelling of 20565204008 in words is "twenty billion, five hundred sixty-five million, two hundred four thousand, eight".