20537653264 has 40 divisors (see below), whose sum is σ = 41164865280. Its totient is φ = 9915907200.

The previous prime is 20537653219. The next prime is 20537653271. The reversal of 20537653264 is 46235673502.

It is a self number, because there is not a number n which added to its sum of digits gives 20537653264.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183747 + ... + 273565.

It is an arithmetic number, because the mean of its divisors is an integer number (1029121632).

Almost surely, 2^20537653264 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20537653264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20582432640).

20537653264 is an abundant number, since it is smaller than the sum of its proper divisors (20627212016).

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

20537653264 is a wasteful number, since it uses less digits than its factorization.

20537653264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90319 (or 90313 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 43.

The spelling of 20537653264 in words is "twenty billion, five hundred thirty-seven million, six hundred fifty-three thousand, two hundred sixty-four".