23031240 has 64 divisors (see below), whose sum is σ = 70286400. Its totient is φ = 6035712.

The previous prime is 23031227. The next prime is 23031247. The reversal of 23031240 is 4213032.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (23031247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5454 + ... + 8706.

It is an arithmetic number, because the mean of its divisors is an integer number (1098225).

Almost surely, 2^23031240 is an apocalyptic number.

23031240 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 23031240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35143200).

23031240 is an abundant number, since it is smaller than the sum of its proper divisors (47255160).

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

23031240 is a wasteful number, since it uses less digits than its factorization.

23031240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326 (or 3322 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 23031240 is about 4799.0874132485. The cubic root of 23031240 is about 284.5153968418.

Adding to 23031240 its reverse (4213032), we get a palindrome (27244272).

The spelling of 23031240 in words is "twenty-three million, thirty-one thousand, two hundred forty".