22681240 has 16 divisors (see below), whose sum is σ = 51032880. Its totient is φ = 9072480.

The previous prime is 22681207. The next prime is 22681271. The reversal of 22681240 is 4218622.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283476 + ... + 283555.

It is an arithmetic number, because the mean of its divisors is an integer number (3189555).

Almost surely, 2^22681240 is an apocalyptic number.

22681240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22681240 is an abundant number, since it is smaller than the sum of its proper divisors (28351640).

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

22681240 is a wasteful number, since it uses less digits than its factorization.

22681240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567042 (or 567038 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 22681240 is about 4762.4825458998. The cubic root of 22681240 is about 283.0667974027.

Adding to 22681240 its reverse (4218622), we get a palindrome (26899862).

The spelling of 22681240 in words is "twenty-two million, six hundred eighty-one thousand, two hundred forty".