22505440 has 24 divisors (see below), whose sum is σ = 53169480. Its totient is φ = 9002112.

The previous prime is 22505429. The next prime is 22505447. The reversal of 22505440 is 4450522.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22505447) 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, 70170 + ... + 70489.

It is an arithmetic number, because the mean of its divisors is an integer number (2215395).

Almost surely, 2^22505440 is an apocalyptic number.

22505440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22505440 is an abundant number, since it is smaller than the sum of its proper divisors (30664040).

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

22505440 is a wasteful number, since it uses less digits than its factorization.

22505440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140674 (or 140666 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 22505440 is about 4743.9898819454. The cubic root of 22505440 is about 282.3335589909. Note that the first 3 decimals are identical.

Adding to 22505440 its reverse (4450522), we get a palindrome (26955962).

The spelling of 22505440 in words is "twenty-two million, five hundred five thousand, four hundred forty".