22523240 has 16 divisors (see below), whose sum is σ = 50677380. Its totient is φ = 9009280.

The previous prime is 22523239. The next prime is 22523243. The reversal of 22523240 is 4232522.

It can be written as a sum of positive squares in 2 ways, for example, as 18369796 + 4153444 = 4286^2 + 2038^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (22523243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281501 + ... + 281580.

Almost surely, 2^22523240 is an apocalyptic number.

22523240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22523240 is an abundant number, since it is smaller than the sum of its proper divisors (28154140).

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

22523240 is a wasteful number, since it uses less digits than its factorization.

22523240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563092 (or 563088 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 22523240 is about 4745.8655691033. The cubic root of 22523240 is about 282.4079737842.

Adding to 22523240 its reverse (4232522), we get a palindrome (26755762).

The spelling of 22523240 in words is "twenty-two million, five hundred twenty-three thousand, two hundred forty".