23031320 has 48 divisors (see below), whose sum is σ = 56129760. Its totient is φ = 8501376.

The previous prime is 23031319. The next prime is 23031329. The reversal of 23031320 is 2313032.

It is a junction number, because it is equal to n+sod(n) for n = 23031295 and 23031304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23031329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5057 + ... + 8463.

It is an arithmetic number, because the mean of its divisors is an integer number (1169370).

Almost surely, 2^23031320 is an apocalyptic number.

23031320 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 23031320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28064880).

23031320 is an abundant number, since it is smaller than the sum of its proper divisors (33098440).

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

23031320 is a wasteful number, since it uses less digits than its factorization.

23031320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444 (or 3427 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 23031320 is about 4799.0957481592. The cubic root of 23031320 is about 284.5157262669.

Adding to 23031320 its reverse (2313032), we get a palindrome (25344352).

The spelling of 23031320 in words is "twenty-three million, thirty-one thousand, three hundred twenty".