231331020 has 96 divisors (see below), whose sum is σ = 667892736. Its totient is φ = 59788800.

The previous prime is 231331007. The next prime is 231331049. The reversal of 231331020 is 20133132.

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 666487 + ... + 666833.

It is an arithmetic number, because the mean of its divisors is an integer number (6957216).

Almost surely, 2^231331020 is an apocalyptic number.

231331020 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 231331020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333946368).

231331020 is an abundant number, since it is smaller than the sum of its proper divisors (436561716).

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

231331020 is a wasteful number, since it uses less digits than its factorization.

231331020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 231331020 is about 15209.5700136460. The cubic root of 231331020 is about 613.8721877785.

Adding to 231331020 its reverse (20133132), we get a palindrome (251464152).

It can be divided in two parts, 2313 and 31020, that added together give a palindrome (33333).

The spelling of 231331020 in words is "two hundred thirty-one million, three hundred thirty-one thousand, twenty".