22455220 has 12 divisors (see below), whose sum is σ = 47156004. Its totient is φ = 8982080.

The previous prime is 22455217. The next prime is 22455221. The reversal of 22455220 is 2255422.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4848804 + 17606416 = 2202^2 + 4196^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22455191 and 22455200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22455221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561361 + ... + 561400.

It is an arithmetic number, because the mean of its divisors is an integer number (3929667).

Almost surely, 2^22455220 is an apocalyptic number.

22455220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22455220 is an abundant number, since it is smaller than the sum of its proper divisors (24700784).

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

22455220 is a wasteful number, since it uses less digits than its factorization.

22455220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122770 (or 1122768 counting only the distinct ones).

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

The square root of 22455220 is about 4738.6939128836. The cubic root of 22455220 is about 282.1233971975.

The spelling of 22455220 in words is "twenty-two million, four hundred fifty-five thousand, two hundred twenty".