23021320 has 32 divisors (see below), whose sum is σ = 59198400. Its totient is φ = 7892928.

The previous prime is 23021291. The next prime is 23021333. The reversal of 23021320 is 2312032.

It is a happy number.

23021320 is nontrivially palindromic in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 23021320.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40830 + ... + 41389.

It is an arithmetic number, because the mean of its divisors is an integer number (1849950).

Almost surely, 2^23021320 is an apocalyptic number.

23021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23021320 is an abundant number, since it is smaller than the sum of its proper divisors (36177080).

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

23021320 is a wasteful number, since it uses less digits than its factorization.

23021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82237 (or 82233 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 23021320 is about 4798.0537721039. The cubic root of 23021320 is about 284.4745422163.

Adding to 23021320 its reverse (2312032), we get a palindrome (25333352).

The spelling of 23021320 in words is "twenty-three million, twenty-one thousand, three hundred twenty".