225671820 has 48 divisors (see below), whose sum is σ = 689326848. Its totient is φ = 54708160.

The previous prime is 225671819. The next prime is 225671851. The reversal of 225671820 is 28176522.

It is a super-2 number, since 2×225671820² = 101855540684224800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170304 + ... + 171623.

It is an arithmetic number, because the mean of its divisors is an integer number (14360976).

Almost surely, 2^225671820 is an apocalyptic number.

225671820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225671820 is an abundant number, since it is smaller than the sum of its proper divisors (463655028).

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

225671820 is a wasteful number, since it uses less digits than its factorization.

225671820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341950 (or 341948 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 225671820 is about 15022.3773085354. The cubic root of 225671820 is about 608.8249528585.

The spelling of 225671820 in words is "two hundred twenty-five million, six hundred seventy-one thousand, eight hundred twenty".