20811547776 has 32 divisors (see below), whose sum is σ = 55280674800. Its totient is φ = 6937182464.

The previous prime is 20811547721. The next prime is 20811547819. The reversal of 20811547776 is 67774511802.

It is a tau number, because it is divible by the number of its divisors (32).

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

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, 27097986 + ... + 27098753.

Almost surely, 2^20811547776 is an apocalyptic number.

It is an amenable number.

20811547776 is an abundant number, since it is smaller than the sum of its proper divisors (34469127024).

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

20811547776 is an equidigital number, since it uses as much as digits as its factorization.

20811547776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54196756 (or 54196744 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 48.

The spelling of 20811547776 in words is "twenty billion, eight hundred eleven million, five hundred forty-seven thousand, seven hundred seventy-six".