22913240 has 128 divisors (see below), whose sum is σ = 63936000. Its totient is φ = 7216128.

The previous prime is 22913237. The next prime is 22913251. The reversal of 22913240 is 4231922.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 313844 + ... + 313916.

It is an arithmetic number, because the mean of its divisors is an integer number (499500).

Almost surely, 2^22913240 is an apocalyptic number.

22913240 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 22913240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31968000).

22913240 is an abundant number, since it is smaller than the sum of its proper divisors (41022760).

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

22913240 is a wasteful number, since it uses less digits than its factorization.

22913240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 22913240 is about 4786.7776217410. Note that the first 3 decimals coincide. The cubic root of 22913240 is about 284.0286620547.

The spelling of 22913240 in words is "twenty-two million, nine hundred thirteen thousand, two hundred forty".