225929820 has 24 divisors (see below), whose sum is σ = 632603664. Its totient is φ = 60247936.

The previous prime is 225929819. The next prime is 225929833. The reversal of 225929820 is 28929522.

It is a congruent number.

It is an unprimeable number.

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, 1882689 + ... + 1882808.

It is an arithmetic number, because the mean of its divisors is an integer number (26358486).

Almost surely, 2^225929820 is an apocalyptic number.

225929820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225929820 is an abundant number, since it is smaller than the sum of its proper divisors (406673844).

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

225929820 is a wasteful number, since it uses less digits than its factorization.

225929820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3765509 (or 3765507 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 225929820 is about 15030.9620450589. The cubic root of 225929820 is about 609.0568781624.

The spelling of 225929820 in words is "two hundred twenty-five million, nine hundred twenty-nine thousand, eight hundred twenty".