20130231 has 16 divisors (see below), whose sum is σ = 29559168. Its totient is φ = 12084000.

The previous prime is 20130223. The next prime is 20130233. The reversal of 20130231 is 13203102.

It is a happy number.

It is not a de Polignac number, because 20130231 - 2³ = 20130223 is a prime.

It is a super-2 number, since 2×20130231² = 810452400226722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 681 + ... + 6381.

It is an arithmetic number, because the mean of its divisors is an integer number (1847448).

Almost surely, 2^20130231 is an apocalyptic number.

20130231 is a deficient number, since it is larger than the sum of its proper divisors (9428937).

20130231 is a wasteful number, since it uses less digits than its factorization.

20130231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5822.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20130231 is about 4486.6725978168. The cubic root of 20130231 is about 272.0296563325.

Adding to 20130231 its reverse (13203102), we get a palindrome (33333333).

The spelling of 20130231 in words is "twenty million, one hundred thirty thousand, two hundred thirty-one".