20865905968 has 20 divisors (see below), whose sum is σ = 40939438240. Its totient is φ = 10300889664.

The previous prime is 20865905869. The next prime is 20865905989. The reversal of 20865905968 is 86950956802.

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, 8252655 + ... + 8255182.

It is an arithmetic number, because the mean of its divisors is an integer number (2046971912).

Almost surely, 2^20865905968 is an apocalyptic number.

It is an amenable number.

20865905968 is a deficient number, since it is larger than the sum of its proper divisors (20073532272).

20865905968 is a wasteful number, since it uses less digits than its factorization.

20865905968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16507924 (or 16507918 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 58.

The spelling of 20865905968 in words is "twenty billion, eight hundred sixty-five million, nine hundred five thousand, nine hundred sixty-eight".