191020 has 12 divisors (see below), whose sum is σ = 401184. Its totient is φ = 76400.

The previous prime is 190997. The next prime is 191021. The reversal of 191020 is 20191.

191020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (191021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4756 + ... + 4795.

It is an arithmetic number, because the mean of its divisors is an integer number (33432).

2¹⁹¹⁰²⁰ is an apocalyptic number.

191020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191020 is an abundant number, since it is smaller than the sum of its proper divisors (210164).

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

191020 is a wasteful number, since it uses less digits than its factorization.

191020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9560 (or 9558 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 191020 is about 437.0583485074. The cubic root of 191020 is about 57.5916622448.

The spelling of 191020 in words is "one hundred ninety-one thousand, twenty".