20564212650 has 96 divisors (see below), whose sum is σ = 51845788800. Its totient is φ = 5393498880.

The previous prime is 20564212619. The next prime is 20564212657. The reversal of 20564212650 is 5621246502.

It is not an unprimeable number, because it can be changed into a prime (20564212657) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2297584 + ... + 2306516.

It is an arithmetic number, because the mean of its divisors is an integer number (540060300).

Almost surely, 2^20564212650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20564212650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25922894400).

20564212650 is an abundant number, since it is smaller than the sum of its proper divisors (31281576150).

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

20564212650 is a wasteful number, since it uses less digits than its factorization.

20564212650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9200 (or 9195 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 20564212650 in words is "twenty billion, five hundred sixty-four million, two hundred twelve thousand, six hundred fifty".