233231220 has 72 divisors (see below), whose sum is σ = 714528360. Its totient is φ = 61574400.

The previous prime is 233231179. The next prime is 233231263. The reversal of 233231220 is 22132332.

It is a happy number.

233231220 is a `hidden beast` number, since 2 + 332 + 312 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 112275216 + 120956004 = 10596^2 + 10998^2 .

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 = 233231193 and 233231202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11766 + ... + 24594.

It is an arithmetic number, because the mean of its divisors is an integer number (9924005).

Almost surely, 2^233231220 is an apocalyptic number.

233231220 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 233231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (357264180).

233231220 is an abundant number, since it is smaller than the sum of its proper divisors (481297140).

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

233231220 is a wasteful number, since it uses less digits than its factorization.

233231220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12945 (or 12940 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 233231220 is about 15271.9095073275. The cubic root of 233231220 is about 615.5484300828.

Adding to 233231220 its reverse (22132332), we get a palindrome (255363552).

It can be divided in two parts, 2332312 and 20, that added together give a palindrome (2332332).

The spelling of 233231220 in words is "two hundred thirty-three million, two hundred thirty-one thousand, two hundred twenty".