20904333264 has 60 divisors (see below), whose sum is σ = 58557065476. Its totient is φ = 6961683456.

The previous prime is 20904333257. The next prime is 20904333269. The reversal of 20904333264 is 46233340902.

It can be written as a sum of positive squares in 2 ways, for example, as 13354113600 + 7550219664 = 115560^2 + 86892^2 .

It is a super-2 number, since 2×20904333264² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20904333269) 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 11 ways as a sum of consecutive naturals, for example, 90984 + ... + 223800.

Almost surely, 2^20904333264 is an apocalyptic number.

20904333264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20904333264 is an abundant number, since it is smaller than the sum of its proper divisors (37652732212).

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

20904333264 is a wasteful number, since it uses less digits than its factorization.

20904333264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133924 (or 133915 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

The spelling of 20904333264 in words is "twenty billion, nine hundred four million, three hundred thirty-three thousand, two hundred sixty-four".