233312220 has 72 divisors (see below), whose sum is σ = 710878896. Its totient is φ = 61938432.

The previous prime is 233312203. The next prime is 233312237. The reversal of 233312220 is 22213332.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (233312203) and next prime (233312237).

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 = 233312193 and 233312202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39159 + ... + 44721.

It is an arithmetic number, because the mean of its divisors is an integer number (9873318).

Almost surely, 2^233312220 is an apocalyptic number.

233312220 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 233312220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (355439448).

233312220 is an abundant number, since it is smaller than the sum of its proper divisors (477566676).

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

233312220 is a wasteful number, since it uses less digits than its factorization.

233312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5811 (or 5806 counting only the distinct ones).

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

The square root of 233312220 is about 15274.5612048268. The cubic root of 233312220 is about 615.6196807669.

Adding to 233312220 its reverse (22213332), we get a palindrome (255525552).

The spelling of 233312220 in words is "two hundred thirty-three million, three hundred twelve thousand, two hundred twenty".