22545220 has 24 divisors (see below), whose sum is σ = 47818008. Its totient is φ = 8928000.

The previous prime is 22545217. The next prime is 22545227. The reversal of 22545220 is 2254522.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1915456 + 20629764 = 1384^2 + 4542^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22545191 and 22545200.

It is not an unprimeable number, because it can be changed into a prime (22545227) 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, 3561 + ... + 7600.

It is an arithmetic number, because the mean of its divisors is an integer number (1992417).

Almost surely, 2^22545220 is an apocalyptic number.

22545220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22545220 is an abundant number, since it is smaller than the sum of its proper divisors (25272788).

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

22545220 is a wasteful number, since it uses less digits than its factorization.

22545220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11271 (or 11269 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 22545220 is about 4748.1807042277. The cubic root of 22545220 is about 282.4998094342.

Adding to 22545220 its reverse (2254522), we get a palindrome (24799742).

The spelling of 22545220 in words is "twenty-two million, five hundred forty-five thousand, two hundred twenty".