22236520 has 32 divisors (see below), whose sum is σ = 50171400. Its totient is φ = 8869888.

The previous prime is 22236509. The next prime is 22236541. The reversal of 22236520 is 2563222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19131876 + 3104644 = 4374^2 + 1762^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22236491 and 22236500.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22272 + ... + 23248.

Almost surely, 2^22236520 is an apocalyptic number.

22236520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22236520 is an abundant number, since it is smaller than the sum of its proper divisors (27934880).

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

22236520 is a wasteful number, since it uses less digits than its factorization.

22236520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1553 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 22236520 is about 4715.5614724018. The cubic root of 22236520 is about 281.2045049045.

Adding to 22236520 its reverse (2563222), we get a palindrome (24799742).

The spelling of 22236520 in words is "twenty-two million, two hundred thirty-six thousand, five hundred twenty".