22523340 has 144 divisors (see below), whose sum is σ = 75382272. Its totient is φ = 5007744.

The previous prime is 22523339. The next prime is 22523353. The reversal of 22523340 is 4332522.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 138099 + ... + 138261.

It is an arithmetic number, because the mean of its divisors is an integer number (523488).

Almost surely, 2^22523340 is an apocalyptic number.

22523340 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 22523340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37691136).

22523340 is an abundant number, since it is smaller than the sum of its proper divisors (52858932).

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

22523340 is a wasteful number, since it uses less digits than its factorization.

22523340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 22523340 is about 4745.8761045775. The cubic root of 22523340 is about 282.4083917341.

Adding to 22523340 its reverse (4332522), we get a palindrome (26855862).

The spelling of 22523340 in words is "twenty-two million, five hundred twenty-three thousand, three hundred forty".