820188 has 18 divisors (see below), whose sum is σ = 2073344. Its totient is φ = 273384.

The previous prime is 820187. The next prime is 820201. The reversal of 820188 is 881028.

820188 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820187) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11356 + ... + 11427.

2⁸²⁰¹⁸⁸ is an apocalyptic number.

It is an amenable number.

820188 is an abundant number, since it is smaller than the sum of its proper divisors (1253156).

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

820188 is a wasteful number, since it uses less digits than its factorization.

820188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22793 (or 22788 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 820188 is about 905.6423134991. The cubic root of 820188 is about 93.6061687804.

The spelling of 820188 in words is "eight hundred twenty thousand, one hundred eighty-eight".