20190191 has 8 divisors (see below), whose sum is σ = 23510304. Its totient is φ = 16979040.

The previous prime is 20190187. The next prime is 20190221. The reversal of 20190191 is 19109102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20190191 - 2² = 20190187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20190161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26840 + ... + 27581.

It is an arithmetic number, because the mean of its divisors is an integer number (2938788).

Almost surely, 2^20190191 is an apocalyptic number.

20190191 is a deficient number, since it is larger than the sum of its proper divisors (3320113).

20190191 is an equidigital number, since it uses as much as digits as its factorization.

20190191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54481.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 20190191 is about 4493.3496414145. The cubic root of 20190191 is about 272.2994782132.

Adding to 20190191 its reverse (19109102), we get a palindrome (39299293).

The spelling of 20190191 in words is "twenty million, one hundred ninety thousand, one hundred ninety-one".