225404020 has 24 divisors (see below), whose sum is σ = 501193224. Its totient is φ = 84857856.

The previous prime is 225404017. The next prime is 225404059. The reversal of 225404020 is 20404522.

It can be written as a sum of positive squares in 4 ways, for example, as 9960336 + 215443684 = 3156^2 + 14678^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331137 + ... + 331816.

It is an arithmetic number, because the mean of its divisors is an integer number (20883051).

Almost surely, 2^225404020 is an apocalyptic number.

225404020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225404020 is an abundant number, since it is smaller than the sum of its proper divisors (275789204).

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

225404020 is a wasteful number, since it uses less digits than its factorization.

225404020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662979 (or 662977 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 225404020 is about 15013.4612931196. The cubic root of 225404020 is about 608.5840309477.

Adding to 225404020 its reverse (20404522), we get a palindrome (245808542).

The spelling of 225404020 in words is "two hundred twenty-five million, four hundred four thousand, twenty".