22004240 has 20 divisors (see below), whose sum is σ = 51160044. Its totient is φ = 8801664.

The previous prime is 22004237. The next prime is 22004251. The reversal of 22004240 is 4240022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8667136 + 13337104 = 2944^2 + 3652^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137447 + ... + 137606.

Almost surely, 2^22004240 is an apocalyptic number.

22004240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22004240 is an abundant number, since it is smaller than the sum of its proper divisors (29155804).

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

22004240 is a wasteful number, since it uses less digits than its factorization.

22004240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275066 (or 275060 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 22004240 is about 4690.8677235667. The cubic root of 22004240 is about 280.2219328892.

Adding to 22004240 its reverse (4240022), we get a palindrome (26244262).

The spelling of 22004240 in words is "twenty-two million, four thousand, two hundred forty".