180199820 has 12 divisors (see below), whose sum is σ = 378419664. Its totient is φ = 72079920.

The previous prime is 180199787. The next prime is 180199849. The reversal of 180199820 is 28991081.

180199820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4504976 + ... + 4505015.

It is an arithmetic number, because the mean of its divisors is an integer number (31534972).

Almost surely, 2^180199820 is an apocalyptic number.

180199820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

180199820 is an abundant number, since it is smaller than the sum of its proper divisors (198219844).

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

180199820 is a wasteful number, since it uses less digits than its factorization.

180199820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010000 (or 9009998 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 180199820 is about 13423.8526511579. The cubic root of 180199820 is about 564.8304709744.

The spelling of 180199820 in words is "one hundred eighty million, one hundred ninety-nine thousand, eight hundred twenty".