22550220 has 144 divisors (see below), whose sum is σ = 85333248. Its totient is φ = 4682880.

The previous prime is 22550219. The next prime is 22550243. The reversal of 22550220 is 2205522.

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 = 22550193 and 22550202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13047 + ... + 14673.

It is an arithmetic number, because the mean of its divisors is an integer number (592592).

Almost surely, 2^22550220 is an apocalyptic number.

22550220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22550220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42666624).

22550220 is an abundant number, since it is smaller than the sum of its proper divisors (62783028).

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

22550220 is a wasteful number, since it uses less digits than its factorization.

22550220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660 (or 1655 counting only the distinct ones).

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

The square root of 22550220 is about 4748.7071924893. The cubic root of 22550220 is about 282.5206918302.

Adding to 22550220 its reverse (2205522), we get a palindrome (24755742).

It can be divided in two parts, 225502 and 20, that added together give a palindrome (225522).

The spelling of 22550220 in words is "twenty-two million, five hundred fifty thousand, two hundred twenty".