231330031020 has 144 divisors (see below), whose sum is σ = 767580323328. Its totient is φ = 55927025280.

The previous prime is 231330031013. The next prime is 231330031033. The reversal of 231330031020 is 20130033132.

231330031020 is a `hidden beast` number, since 2 + 3 + 1 + 330 + 0 + 310 + 20 = 666.

231330031020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231330030984 and 231330031002.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 567487 + ... + 885833.

It is an arithmetic number, because the mean of its divisors is an integer number (5330418912).

Almost surely, 2^231330031020 is an apocalyptic number.

231330031020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231330031020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383790161664).

231330031020 is an abundant number, since it is smaller than the sum of its proper divisors (536250292308).

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

231330031020 is a wasteful number, since it uses less digits than its factorization.

231330031020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318740 (or 318735 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 231330031020 its reverse (20130033132), we get a palindrome (251460064152).

The spelling of 231330031020 in words is "two hundred thirty-one billion, three hundred thirty million, thirty-one thousand, twenty".