191290020 has 48 divisors (see below), whose sum is σ = 538419840. Its totient is φ = 50743296.

The previous prime is 191290019. The next prime is 191290027. The reversal of 191290020 is 20092191.

It is not an unprimeable number, because it can be changed into a prime (191290027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3321 + ... + 19839.

It is an arithmetic number, because the mean of its divisors is an integer number (11217080).

Almost surely, 2^191290020 is an apocalyptic number.

191290020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191290020 is an abundant number, since it is smaller than the sum of its proper divisors (347129820).

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

191290020 is a wasteful number, since it uses less digits than its factorization.

191290020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16724 (or 16722 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 191290020 is about 13830.7635364068. The cubic root of 191290020 is about 576.1878606946.

The spelling of 191290020 in words is "one hundred ninety-one million, two hundred ninety thousand, twenty".