225031220 has 12 divisors (see below), whose sum is σ = 472565604. Its totient is φ = 90012480.

The previous prime is 225031217. The next prime is 225031291. The reversal of 225031220 is 22130522.

225031220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 48832144 + 176199076 = 6988^2 + 13274^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5625761 + ... + 5625800.

It is an arithmetic number, because the mean of its divisors is an integer number (39380467).

Almost surely, 2^225031220 is an apocalyptic number.

225031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225031220 is an abundant number, since it is smaller than the sum of its proper divisors (247534384).

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

225031220 is a wasteful number, since it uses less digits than its factorization.

225031220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11251570 (or 11251568 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 225031220 is about 15001.0406305696. The cubic root of 225031220 is about 608.2483295669.

Adding to 225031220 its reverse (22130522), we get a palindrome (247161742).

The spelling of 225031220 in words is "two hundred twenty-five million, thirty-one thousand, two hundred twenty".