20565604466 has 16 divisors (see below), whose sum is σ = 33681058848. Its totient is φ = 9340154400.

The previous prime is 20565604441. The next prime is 20565604481. The reversal of 20565604466 is 66440656502.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 365540 + ... + 418031.

It is an arithmetic number, because the mean of its divisors is an integer number (2105066178).

Almost surely, 2^20565604466 is an apocalyptic number.

20565604466 is a deficient number, since it is larger than the sum of its proper divisors (13115454382).

20565604466 is a wasteful number, since it uses less digits than its factorization.

20565604466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784777.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 20565604466 in words is "twenty billion, five hundred sixty-five million, six hundred four thousand, four hundred sixty-six".