820170198 has 56 divisors (see below), whose sum is σ = 1856805888. Its totient is φ = 271572912.

The previous prime is 820170161. The next prime is 820170217. The reversal of 820170198 is 891071028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 227115 + ... + 230697.

It is an arithmetic number, because the mean of its divisors is an integer number (33157248).

Almost surely, 2^820170198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 820170198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (928402944).

820170198 is an abundant number, since it is smaller than the sum of its proper divisors (1036635690).

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

820170198 is a wasteful number, since it uses less digits than its factorization.

820170198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3760 (or 3745 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 820170198 is about 28638.6137583508. The cubic root of 820170198 is about 936.0549154171.

The spelling of 820170198 in words is "eight hundred twenty million, one hundred seventy thousand, one hundred ninety-eight".