20646826266 has 16 divisors (see below), whose sum is σ = 45047621088. Its totient is φ = 6256614000.

The previous prime is 20646826259. The next prime is 20646826271. The reversal of 20646826266 is 66262864602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156415285 + ... + 156415416.

It is an arithmetic number, because the mean of its divisors is an integer number (2815476318).

Almost surely, 2^20646826266 is an apocalyptic number.

20646826266 is an abundant number, since it is smaller than the sum of its proper divisors (24400794822).

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

20646826266 is a wasteful number, since it uses less digits than its factorization.

20646826266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312830717.

The product of its (nonzero) digits is 1990656, while the sum is 48.

The spelling of 20646826266 in words is "twenty billion, six hundred forty-six million, eight hundred twenty-six thousand, two hundred sixty-six".