23091240 has 64 divisors (see below), whose sum is σ = 69600960. Its totient is φ = 6128640.

The previous prime is 23091227. The next prime is 23091281. The reversal of 23091240 is 4219032.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40155 + ... + 40725.

It is an arithmetic number, because the mean of its divisors is an integer number (1087515).

Almost surely, 2^23091240 is an apocalyptic number.

23091240 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 23091240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34800480).

23091240 is an abundant number, since it is smaller than the sum of its proper divisors (46509720).

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

23091240 is a wasteful number, since it uses less digits than its factorization.

23091240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 23091240 is about 4805.3345357009. The cubic root of 23091240 is about 284.7622517091.

The spelling of 23091240 in words is "twenty-three million, ninety-one thousand, two hundred forty".