181820120 has 32 divisors (see below), whose sum is σ = 430628400. Its totient is φ = 68899968.

The previous prime is 181820069. The next prime is 181820153. The reversal of 181820120 is 21028181.

It is a happy number.

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, 118859 + ... + 120378.

Almost surely, 2^181820120 is an apocalyptic number.

181820120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181820120 is an abundant number, since it is smaller than the sum of its proper divisors (248808280).

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

181820120 is a wasteful number, since it uses less digits than its factorization.

181820120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239267 (or 239263 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 181820120 is about 13484.0691187786. The cubic root of 181820120 is about 566.5183479569.

The spelling of 181820120 in words is "one hundred eighty-one million, eight hundred twenty thousand, one hundred twenty".