20131131230 has 128 divisors (see below), whose sum is σ = 45479854080. Its totient is φ = 6256465920.

The previous prime is 20131131203. The next prime is 20131131239. The reversal of 20131131230 is 3213113102.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 20131131199 and 20131131208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131131239) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8446619 + ... + 8449001.

It is an arithmetic number, because the mean of its divisors is an integer number (355311360).

Almost surely, 2^20131131230 is an apocalyptic number.

20131131230 is an abundant number, since it is smaller than the sum of its proper divisors (25348722850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20131131230 is a wasteful number, since it uses less digits than its factorization.

20131131230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 20131131230 its reverse (3213113102), we get a palindrome (23344244332).

The spelling of 20131131230 in words is "twenty billion, one hundred thirty-one million, one hundred thirty-one thousand, two hundred thirty".