231960820 has 96 divisors (see below), whose sum is σ = 603203328. Its totient is φ = 72963072.

The previous prime is 231960811. The next prime is 231960851. The reversal of 231960820 is 28069132.

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, 423787 + ... + 424333.

It is an arithmetic number, because the mean of its divisors is an integer number (6283368).

Almost surely, 2^231960820 is an apocalyptic number.

231960820 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 231960820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301601664).

231960820 is an abundant number, since it is smaller than the sum of its proper divisors (371242508).

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

231960820 is a wasteful number, since it uses less digits than its factorization.

231960820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809 (or 807 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 231960820 is about 15230.2600109125. The cubic root of 231960820 is about 614.4287731400.

The spelling of 231960820 in words is "two hundred thirty-one million, nine hundred sixty thousand, eight hundred twenty".