20804923776 has 128 divisors (see below), whose sum is σ = 68016211200. Its totient is φ = 5487003648.

The previous prime is 20804923729. The next prime is 20804923801. The reversal of 20804923776 is 67732940802.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 262746 + ... + 332633.

It is an arithmetic number, because the mean of its divisors is an integer number (531376650).

Almost surely, 2^20804923776 is an apocalyptic number.

20804923776 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20804923776 is an abundant number, since it is smaller than the sum of its proper divisors (47211287424).

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

20804923776 is a wasteful number, since it uses less digits than its factorization.

20804923776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595416 (or 595404 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 48.

The spelling of 20804923776 in words is "twenty billion, eight hundred four million, nine hundred twenty-three thousand, seven hundred seventy-six".