20375191 has 4 divisors (see below), whose sum is σ = 20408832. Its totient is φ = 20341552.

The previous prime is 20375189. The next prime is 20375209. The reversal of 20375191 is 19157302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19157302 = 2 ⋅9578651.

It is a cyclic number.

It is not a de Polignac number, because 20375191 - 2¹ = 20375189 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 (20375101) 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, 15895 + ... + 17128.

It is an arithmetic number, because the mean of its divisors is an integer number (5102208).

Almost surely, 2^20375191 is an apocalyptic number.

20375191 is a deficient number, since it is larger than the sum of its proper divisors (33641).

20375191 is an equidigital number, since it uses as much as digits as its factorization.

20375191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33640.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 20375191 is about 4513.8886782906. Note that the first 3 decimals coincide. The cubic root of 20375191 is about 273.1286320159.

The spelling of 20375191 in words is "twenty million, three hundred seventy-five thousand, one hundred ninety-one".