20813578312 has 64 divisors (see below), whose sum is σ = 42813757440. Its totient is φ = 9443174400.

The previous prime is 20813578283. The next prime is 20813578337. The reversal of 20813578312 is 21387531802.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1133428 + ... + 1151644.

It is an arithmetic number, because the mean of its divisors is an integer number (668964960).

Almost surely, 2^20813578312 is an apocalyptic number.

It is an amenable number.

20813578312 is an abundant number, since it is smaller than the sum of its proper divisors (22000179128).

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

20813578312 is a wasteful number, since it uses less digits than its factorization.

20813578312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18542 (or 18538 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 20813578312 in words is "twenty billion, eight hundred thirteen million, five hundred seventy-eight thousand, three hundred twelve".