20456491312 has 80 divisors (see below), whose sum is σ = 41283072000. Its totient is φ = 9813323520.

The previous prime is 20456491277. The next prime is 20456491331. The reversal of 20456491312 is 21319465402.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8850637 + ... + 8852947.

It is an arithmetic number, because the mean of its divisors is an integer number (516038400).

Almost surely, 2^20456491312 is an apocalyptic number.

It is an amenable number.

20456491312 is an abundant number, since it is smaller than the sum of its proper divisors (20826580688).

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

20456491312 is a wasteful number, since it uses less digits than its factorization.

20456491312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594 (or 2588 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 20456491312 in words is "twenty billion, four hundred fifty-six million, four hundred ninety-one thousand, three hundred twelve".