225544420 has 24 divisors (see below), whose sum is σ = 474075000. Its totient is φ = 90135552.

The previous prime is 225544387. The next prime is 225544427. The reversal of 225544420 is 24445522.

It can be written as a sum of positive squares in 4 ways, for example, as 82119844 + 143424576 = 9062^2 + 11976^2 .

It is not an unprimeable number, because it can be changed into a prime (225544427) 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 7 ways as a sum of consecutive naturals, for example, 20466 + ... + 29494.

It is an arithmetic number, because the mean of its divisors is an integer number (19753125).

Almost surely, 2^225544420 is an apocalyptic number.

225544420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225544420 is an abundant number, since it is smaller than the sum of its proper divisors (248530580).

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

225544420 is a wasteful number, since it uses less digits than its factorization.

225544420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10287 (or 10285 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 28.

The square root of 225544420 is about 15018.1363690706. The cubic root of 225544420 is about 608.7103633046.

Adding to 225544420 its reverse (24445522), we get a palindrome (249989942).

The spelling of 225544420 in words is "two hundred twenty-five million, five hundred forty-four thousand, four hundred twenty".