225040220 has 24 divisors (see below), whose sum is σ = 500384304. Its totient is φ = 84720896.

The previous prime is 225040181. The next prime is 225040223. The reversal of 225040220 is 22040522.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225040223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330602 + ... + 331281.

It is an arithmetic number, because the mean of its divisors is an integer number (20849346).

Almost surely, 2^225040220 is an apocalyptic number.

225040220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225040220 is an abundant number, since it is smaller than the sum of its proper divisors (275344084).

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

225040220 is a wasteful number, since it uses less digits than its factorization.

225040220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661909 (or 661907 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 225040220 is about 15001.3406067591. The cubic root of 225040220 is about 608.2564383114.

Adding to 225040220 its reverse (22040522), we get a palindrome (247080742).

The spelling of 225040220 in words is "two hundred twenty-five million, forty thousand, two hundred twenty".