20320564212 has 72 divisors (see below), whose sum is σ = 55595321600. Its totient is φ = 6221033280.

The previous prime is 20320564211. The next prime is 20320564217. The reversal of 20320564212 is 21246502302.

It is a happy number.

20320564212 is a `hidden beast` number, since 2 + 0 + 3 + 2 + 0 + 5 + 642 + 12 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320564211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15964 + ... + 202227.

Almost surely, 2^20320564212 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 20320564212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27797660800).

20320564212 is an abundant number, since it is smaller than the sum of its proper divisors (35274757388).

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

20320564212 is a wasteful number, since it uses less digits than its factorization.

20320564212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218413 (or 218408 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The spelling of 20320564212 in words is "twenty billion, three hundred twenty million, five hundred sixty-four thousand, two hundred twelve".