20811534760 has 32 divisors (see below), whose sum is σ = 46865709000. Its totient is φ = 8317546240.

The previous prime is 20811534719. The next prime is 20811534773. The reversal of 20811534760 is 6743511802.

It can be written as a sum of positive squares in 4 ways, for example, as 16033130884 + 4778403876 = 126622^2 + 69126^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173035 + ... + 267514.

Almost surely, 2^20811534760 is an apocalyptic number.

20811534760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20811534760 is an abundant number, since it is smaller than the sum of its proper divisors (26054174240).

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

20811534760 is a wasteful number, since it uses less digits than its factorization.

20811534760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441741 (or 441737 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 20811534760 in words is "twenty billion, eight hundred eleven million, five hundred thirty-four thousand, seven hundred sixty".