20646426444 has 48 divisors (see below), whose sum is σ = 55150115328. Its totient is φ = 5889017088.

The previous prime is 20646426439. The next prime is 20646426481. The reversal of 20646426444 is 44462464602.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 20646426396 and 20646426405.

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, 157432 + ... + 257055.

It is an arithmetic number, because the mean of its divisors is an integer number (1148960736).

Almost surely, 2^20646426444 is an apocalyptic number.

It is an amenable number.

20646426444 is an abundant number, since it is smaller than the sum of its proper divisors (34503688884).

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

20646426444 is a wasteful number, since it uses less digits than its factorization.

20646426444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415094 (or 415092 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 42.

The spelling of 20646426444 in words is "twenty billion, six hundred forty-six million, four hundred twenty-six thousand, four hundred forty-four".