20021320233 has 20 divisors (see below), whose sum is σ = 30182794180. Its totient is φ = 13225086432.

The previous prime is 20021320217. The next prime is 20021320247. The reversal of 20021320233 is 33202312002.

It is a happy number.

20021320233 is a `hidden beast` number, since 200 + 213 + 20 + 233 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7259551209 + 12761769024 = 85203^2 + 112968^2 .

It is not a de Polignac number, because 20021320233 - 2⁴ = 20021320217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021320133) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1125010 + ... + 1142667.

It is an arithmetic number, because the mean of its divisors is an integer number (1509139709).

Almost surely, 2^20021320233 is an apocalyptic number.

It is an amenable number.

20021320233 is a deficient number, since it is larger than the sum of its proper divisors (10161473947).

20021320233 is a wasteful number, since it uses less digits than its factorization.

20021320233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2267798 (or 2267789 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 20021320233 its reverse (33202312002), we get a palindrome (53223632235).

The spelling of 20021320233 in words is "twenty billion, twenty-one million, three hundred twenty thousand, two hundred thirty-three".