23133220 has 48 divisors (see below), whose sum is σ = 53778816. Its totient is φ = 8288000.

The previous prime is 23133199. The next prime is 23133263. The reversal of 23133220 is 2233132.

It is a junction number, because it is equal to n+sod(n) for n = 23133194 and 23133203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14880 + ... + 16360.

It is an arithmetic number, because the mean of its divisors is an integer number (1120392).

Almost surely, 2^23133220 is an apocalyptic number.

23133220 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 23133220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26889408).

23133220 is an abundant number, since it is smaller than the sum of its proper divisors (30645596).

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

23133220 is a wasteful number, since it uses less digits than its factorization.

23133220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572 (or 1570 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 23133220 is about 4809.7006143834. The cubic root of 23133220 is about 284.9347136801.

Adding to 23133220 its reverse (2233132), we get a palindrome (25366352).

The spelling of 23133220 in words is "twenty-three million, one hundred thirty-three thousand, two hundred twenty".