20158191 has 12 divisors (see below), whose sum is σ = 29156400. Its totient is φ = 13420800.

The previous prime is 20158181. The next prime is 20158207. The reversal of 20158191 is 19185102.

It is not a de Polignac number, because 20158191 - 2⁷ = 20158063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20158181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11791 + ... + 13391.

It is an arithmetic number, because the mean of its divisors is an integer number (2429700).

Almost surely, 2^20158191 is an apocalyptic number.

20158191 is a deficient number, since it is larger than the sum of its proper divisors (8998209).

20158191 is a wasteful number, since it uses less digits than its factorization.

20158191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3006 (or 3003 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 20158191 is about 4489.7874114483. The cubic root of 20158191 is about 272.1555437844.

The spelling of 20158191 in words is "twenty million, one hundred fifty-eight thousand, one hundred ninety-one".