20811276556 has 24 divisors (see below), whose sum is σ = 42243789056. Its totient is φ = 8785996560.

The previous prime is 20811276547. The next prime is 20811276643. The reversal of 20811276556 is 65567211802.

It is a super-2 number, since 2×20811276556² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5544840 + ... + 5548591.

Almost surely, 2^20811276556 is an apocalyptic number.

It is an amenable number.

20811276556 is an abundant number, since it is smaller than the sum of its proper divisors (21432512500).

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

20811276556 is a wasteful number, since it uses less digits than its factorization.

20811276556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11093509 (or 11093507 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 20811276556 in words is "twenty billion, eight hundred eleven million, two hundred seventy-six thousand, five hundred fifty-six".