20665263672 has 40 divisors (see below), whose sum is σ = 57881874600. Its totient is φ = 6888421008.

The previous prime is 20665263659. The next prime is 20665263739. The reversal of 20665263672 is 27636256602.

It is a happy number.

20665263672 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 5 + 2 + 636 + 7 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15944772 + ... + 15946067.

It is an arithmetic number, because the mean of its divisors is an integer number (1447046865).

Almost surely, 2^20665263672 is an apocalyptic number.

It is an amenable number.

20665263672 is an abundant number, since it is smaller than the sum of its proper divisors (37216610928).

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

20665263672 is a wasteful number, since it uses less digits than its factorization.

20665263672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31890857 (or 31890844 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 45.

The spelling of 20665263672 in words is "twenty billion, six hundred sixty-five million, two hundred sixty-three thousand, six hundred seventy-two".