225345520 has 20 divisors (see below), whose sum is σ = 523928520. Its totient is φ = 90138176.

The previous prime is 225345511. The next prime is 225345521. The reversal of 225345520 is 25543522.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225345521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1408330 + ... + 1408489.

It is an arithmetic number, because the mean of its divisors is an integer number (26196426).

Almost surely, 2^225345520 is an apocalyptic number.

225345520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225345520 is an abundant number, since it is smaller than the sum of its proper divisors (298583000).

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

225345520 is a wasteful number, since it uses less digits than its factorization.

225345520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816832 (or 2816826 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 28.

The square root of 225345520 is about 15011.5129150929. The cubic root of 225345520 is about 608.5313769825.

The spelling of 225345520 in words is "two hundred twenty-five million, three hundred forty-five thousand, five hundred twenty".