22090240 has 40 divisors (see below), whose sum is σ = 52970940. Its totient is φ = 8835072.

The previous prime is 22090219. The next prime is 22090247. The reversal of 22090240 is 4209022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21977344 + 112896 = 4688^2 + 336^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (22090247) 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, 1755 + ... + 6874.

Almost surely, 2^22090240 is an apocalyptic number.

22090240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22090240 is an abundant number, since it is smaller than the sum of its proper divisors (30880700).

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

22090240 is an frugal number, since it uses more digits than its factorization.

22090240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8652 (or 8636 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 22090240 is about 4700.0255318455. The cubic root of 22090240 is about 280.5865256288.

Adding to 22090240 its reverse (4209022), we get a palindrome (26299262).

The spelling of 22090240 in words is "twenty-two million, ninety thousand, two hundred forty".