20394644856 has 16 divisors (see below), whose sum is σ = 50986612200. Its totient is φ = 6798214944.

The previous prime is 20394644843. The next prime is 20394644863. The reversal of 20394644856 is 65844649302.

It is a junction number, because it is equal to n+sod(n) for n = 20394644799 and 20394644808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424888411 + ... + 424888458.

Almost surely, 2^20394644856 is an apocalyptic number.

It is an amenable number.

20394644856 is an abundant number, since it is smaller than the sum of its proper divisors (30591967344).

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

20394644856 is a wasteful number, since it uses less digits than its factorization.

20394644856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849776878 (or 849776874 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 51.

The spelling of 20394644856 in words is "twenty billion, three hundred ninety-four million, six hundred forty-four thousand, eight hundred fifty-six".