22404520 has 16 divisors (see below), whose sum is σ = 50410260. Its totient is φ = 8961792.

The previous prime is 22404497. The next prime is 22404523. The reversal of 22404520 is 2540422.

It can be written as a sum of positive squares in 2 ways, for example, as 19838116 + 2566404 = 4454^2 + 1602^2 .

It is not an unprimeable number, because it can be changed into a prime (22404523) 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, 280017 + ... + 280096.

Almost surely, 2^22404520 is an apocalyptic number.

22404520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22404520 is an abundant number, since it is smaller than the sum of its proper divisors (28005740).

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

22404520 is a wasteful number, since it uses less digits than its factorization.

22404520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560124 (or 560120 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 22404520 is about 4733.3413145473. The cubic root of 22404520 is about 281.9109085969.

Adding to 22404520 its reverse (2540422), we get a palindrome (24944942).

The spelling of 22404520 in words is "twenty-two million, four hundred four thousand, five hundred twenty".