20323111231 has 4 divisors (see below), whose sum is σ = 21023908200. Its totient is φ = 19622314264.

The previous prime is 20323111219. The next prime is 20323111253. The reversal of 20323111231 is 13211132302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13211132302 = 2 ⋅6605566151.

It is a cyclic number.

It is not a de Polignac number, because 20323111231 - 2⁹ = 20323110719 is a prime.

It is a super-2 number, since 2×20323111231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20323111199 and 20323111208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323111201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350398441 + ... + 350398498.

It is an arithmetic number, because the mean of its divisors is an integer number (5255977050).

Almost surely, 2^20323111231 is an apocalyptic number.

20323111231 is a deficient number, since it is larger than the sum of its proper divisors (700796969).

20323111231 is an equidigital number, since it uses as much as digits as its factorization.

20323111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700796968.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20323111231 its reverse (13211132302), we get a palindrome (33534243533).

The spelling of 20323111231 in words is "twenty billion, three hundred twenty-three million, one hundred eleven thousand, two hundred thirty-one".