20131031004 has 96 divisors (see below), whose sum is σ = 54497909760. Its totient is φ = 5664619008.

The previous prime is 20131030999. The next prime is 20131031017. The reversal of 20131031004 is 40013013102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5044642 + ... + 5048630.

It is an arithmetic number, because the mean of its divisors is an integer number (567686560).

Almost surely, 2^20131031004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20131031004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27248954880).

20131031004 is an abundant number, since it is smaller than the sum of its proper divisors (34366878756).

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

20131031004 is a wasteful number, since it uses less digits than its factorization.

20131031004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4899 (or 4897 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20131031004 its reverse (40013013102), we get a palindrome (60144044106).

The spelling of 20131031004 in words is "twenty billion, one hundred thirty-one million, thirty-one thousand, four".