20666188056 has 64 divisors (see below), whose sum is σ = 52819908480. Its totient is φ = 6736308480.

The previous prime is 20666188027. The next prime is 20666188087. The reversal of 20666188056 is 65088166602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20666187996 and 20666188014.

It is a congruent 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, 173391 + ... + 267201.

It is an arithmetic number, because the mean of its divisors is an integer number (825311070).

Almost surely, 2^20666188056 is an apocalyptic number.

It is an amenable number.

20666188056 is an abundant number, since it is smaller than the sum of its proper divisors (32153720424).

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

20666188056 is a wasteful number, since it uses less digits than its factorization.

20666188056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94024 (or 94020 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 20666188056 in words is "twenty billion, six hundred sixty-six million, one hundred eighty-eight thousand, fifty-six".