23111320 has 32 divisors (see below), whose sum is σ = 54263520. Its totient is φ = 8842240.

The previous prime is 23111299. The next prime is 23111321. The reversal of 23111320 is 2311132.

It is a super-2 number, since 2×23111320² = 1068266224284800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23111320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23111321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11641 + ... + 13480.

It is an arithmetic number, because the mean of its divisors is an integer number (1695735).

Almost surely, 2^23111320 is an apocalyptic number.

23111320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23111320 is an abundant number, since it is smaller than the sum of its proper divisors (31152200).

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

23111320 is a wasteful number, since it uses less digits than its factorization.

23111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25155 (or 25151 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 23111320 is about 4807.4234263272. The cubic root of 23111320 is about 284.8447702942.

Adding to 23111320 its reverse (2311132), we get a palindrome (25422452).

The spelling of 23111320 in words is "twenty-three million, one hundred eleven thousand, three hundred twenty".