22204240 has 40 divisors (see below), whose sum is σ = 51824808. Its totient is φ = 8847360.

The previous prime is 22204229. The next prime is 22204241. The reversal of 22204240 is 4240222.

It can be written as a sum of positive squares in 4 ways, for example, as 2383936 + 19820304 = 1544^2 + 4452^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22204241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34320 + ... + 34960.

Almost surely, 2^22204240 is an apocalyptic number.

22204240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22204240 is an abundant number, since it is smaller than the sum of its proper divisors (29620568).

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

22204240 is a wasteful number, since it uses less digits than its factorization.

22204240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087 (or 1081 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 22204240 is about 4712.1375192157. The cubic root of 22204240 is about 281.0683673350.

Adding to 22204240 its reverse (4240222), we get a palindrome (26444462).

The spelling of 22204240 in words is "twenty-two million, two hundred four thousand, two hundred forty".