20130233231 has 4 divisors (see below), whose sum is σ = 20132619192. Its totient is φ = 20127847272.

The previous prime is 20130233219. The next prime is 20130233243. The reversal of 20130233231 is 13233203102.

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

It is an interprime number because it is at equal distance from previous prime (20130233219) and next prime (20130233243).

It is a cyclic number.

It is not a de Polignac number, because 20130233231 - 2¹⁸ = 20129971087 is a prime.

It is a super-2 number, since 2×20130233231² (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 (20130233131) 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, 1180280 + ... + 1197213.

It is an arithmetic number, because the mean of its divisors is an integer number (5033154798).

Almost surely, 2^20130233231 is an apocalyptic number.

20130233231 is a deficient number, since it is larger than the sum of its proper divisors (2385961).

20130233231 is an equidigital number, since it uses as much as digits as its factorization.

20130233231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385960.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 20130233231 its reverse (13233203102), we get a palindrome (33363436333).

The spelling of 20130233231 in words is "twenty billion, one hundred thirty million, two hundred thirty-three thousand, two hundred thirty-one".