20304122231 has 4 divisors (see below), whose sum is σ = 20331450192. Its totient is φ = 20276794272.

The previous prime is 20304122197. The next prime is 20304122309. The reversal of 20304122231 is 13222140302.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20304122231 is a prime.

It is a super-2 number, since 2×20304122231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20304127231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13662866 + ... + 13664351.

It is an arithmetic number, because the mean of its divisors is an integer number (5082862548).

Almost surely, 2^20304122231 is an apocalyptic number.

20304122231 is a deficient number, since it is larger than the sum of its proper divisors (27327961).

20304122231 is an equidigital number, since it uses as much as digits as its factorization.

20304122231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27327960.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20304122231 its reverse (13222140302), we get a palindrome (33526262533).

The spelling of 20304122231 in words is "twenty billion, three hundred four million, one hundred twenty-two thousand, two hundred thirty-one".