225445220 has 96 divisors (see below), whose sum is σ = 635717376. Its totient is φ = 64857600.

The previous prime is 225445201. The next prime is 225445247. The reversal of 225445220 is 22544522.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 225445220.

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 31 ways as a sum of consecutive naturals, for example, 14390 + ... + 25650.

It is an arithmetic number, because the mean of its divisors is an integer number (6622056).

Almost surely, 2^225445220 is an apocalyptic number.

225445220 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 225445220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317858688).

225445220 is an abundant number, since it is smaller than the sum of its proper divisors (410272156).

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

225445220 is a wasteful number, since it uses less digits than its factorization.

225445220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11301 (or 11299 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 225445220 is about 15014.8333324083. The cubic root of 225445220 is about 608.6211082730.

Adding to 225445220 its reverse (22544522), we get a palindrome (247989742).

It can be divided in two parts, 2254 and 45220, that added together give a palindrome (47474).

The spelling of 225445220 in words is "two hundred twenty-five million, four hundred forty-five thousand, two hundred twenty".