20612536864 has 24 divisors (see below), whose sum is σ = 41889996288. Its totient is φ = 9973807680.

The previous prime is 20612536853. The next prime is 20612536909. The reversal of 20612536864 is 46863521602.

It is a self number, because there is not a number n which added to its sum of digits gives 20612536864.

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, 10388392 + ... + 10390375.

It is an arithmetic number, because the mean of its divisors is an integer number (1745416512).

Almost surely, 2^20612536864 is an apocalyptic number.

It is an amenable number.

20612536864 is an abundant number, since it is smaller than the sum of its proper divisors (21277459424).

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

20612536864 is a wasteful number, since it uses less digits than its factorization.

20612536864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20778808 (or 20778800 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 20612536864 in words is "twenty billion, six hundred twelve million, five hundred thirty-six thousand, eight hundred sixty-four".