20320233121 has 4 divisors (see below), whose sum is σ = 20975724544. Its totient is φ = 19664741700.

The previous prime is 20320233119. The next prime is 20320233191. The reversal of 20320233121 is 12133202302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20320233121 - 2¹ = 20320233119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320233191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327745665 + ... + 327745726.

It is an arithmetic number, because the mean of its divisors is an integer number (5243931136).

Almost surely, 2^20320233121 is an apocalyptic number.

It is an amenable number.

20320233121 is a deficient number, since it is larger than the sum of its proper divisors (655491423).

20320233121 is an equidigital number, since it uses as much as digits as its factorization.

20320233121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655491422.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20320233121 its reverse (12133202302), we get a palindrome (32453435423).

The spelling of 20320233121 in words is "twenty billion, three hundred twenty million, two hundred thirty-three thousand, one hundred twenty-one".