22205520 has 60 divisors (see below), whose sum is σ = 74575956. Its totient is φ = 5921280.

The previous prime is 22205497. The next prime is 22205527. The reversal of 22205520 is 2550222.

It can be written as a sum of positive squares in 2 ways, for example, as 13133376 + 9072144 = 3624^2 + 3012^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22205493 and 22205502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22205527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14701 + ... + 16140.

Almost surely, 2^22205520 is an apocalyptic number.

22205520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22205520 is an abundant number, since it is smaller than the sum of its proper divisors (52370436).

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

22205520 is a wasteful number, since it uses less digits than its factorization.

22205520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30860 (or 30851 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 22205520 is about 4712.2733367240. The cubic root of 22205520 is about 281.0737681143.

Adding to 22205520 its reverse (2550222), we get a palindrome (24755742).

The spelling of 22205520 in words is "twenty-two million, two hundred five thousand, five hundred twenty".