20664793338 has 64 divisors (see below), whose sum is σ = 50777763840. Its totient is φ = 5474457792.

The previous prime is 20664793277. The next prime is 20664793339. The reversal of 20664793338 is 83339746602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20664793339) by changing a digit.

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, 237981 + ... + 312992.

It is an arithmetic number, because the mean of its divisors is an integer number (793402560).

Almost surely, 2^20664793338 is an apocalyptic number.

20664793338 is an abundant number, since it is smaller than the sum of its proper divisors (30112970502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20664793338 is a wasteful number, since it uses less digits than its factorization.

20664793338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551051.

The product of its (nonzero) digits is 3919104, while the sum is 51.

The spelling of 20664793338 in words is "twenty billion, six hundred sixty-four million, seven hundred ninety-three thousand, three hundred thirty-eight".