20323221012 has 18 divisors (see below), whose sum is σ = 51372586538. Its totient is φ = 6774406992.

The previous prime is 20323221011. The next prime is 20323221029. The reversal of 20323221012 is 21012232302.

It can be written as a sum of positive squares in only one way, i.e., 17280154116 + 3043066896 = 131454^2 + 55164^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323221011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 282266923 + ... + 282266994.

Almost surely, 2^20323221012 is an apocalyptic number.

It is an amenable number.

20323221012 is an abundant number, since it is smaller than the sum of its proper divisors (31049365526).

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

20323221012 is a wasteful number, since it uses less digits than its factorization.

20323221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564533927 (or 564533922 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20323221012 its reverse (21012232302), we get a palindrome (41335453314).

The spelling of 20323221012 in words is "twenty billion, three hundred twenty-three million, two hundred twenty-one thousand, twelve".