22009520 has 40 divisors (see below), whose sum is σ = 55111056. Its totient is φ = 8126208.

The previous prime is 22009513. The next prime is 22009529. The reversal of 22009520 is 2590022.

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 (20).

It is a junction number, because it is equal to n+sod(n) for n = 22009492 and 22009501.

It is not an unprimeable number, because it can be changed into a prime (22009529) 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, 9542 + ... + 11621.

Almost surely, 2^22009520 is an apocalyptic number.

22009520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22009520 is an abundant number, since it is smaller than the sum of its proper divisors (33101536).

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

22009520 is a wasteful number, since it uses less digits than its factorization.

22009520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21189 (or 21183 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 22009520 is about 4691.4304854703. The cubic root of 22009520 is about 280.2443445316.

Adding to 22009520 its reverse (2590022), we get a palindrome (24599542).

The spelling of 22009520 in words is "twenty-two million, nine thousand, five hundred twenty".