20566263688 has 16 divisors (see below), whose sum is σ = 38645038080. Its totient is φ = 10260920208.

The previous prime is 20566263617. The next prime is 20566263721. The reversal of 20566263688 is 88636266502.

It is a super-2 number, since 2×20566263688² (a number of 21 digits) contains 22 as substring.

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, 2772520 + ... + 2779927.

It is an arithmetic number, because the mean of its divisors is an integer number (2415314880).

Almost surely, 2^20566263688 is an apocalyptic number.

It is an amenable number.

20566263688 is a deficient number, since it is larger than the sum of its proper divisors (18078774392).

20566263688 is a wasteful number, since it uses less digits than its factorization.

20566263688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5552916 (or 5552912 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 20566263688 in words is "twenty billion, five hundred sixty-six million, two hundred sixty-three thousand, six hundred eighty-eight".