20192161 has 4 divisors (see below), whose sum is σ = 22027824. Its totient is φ = 18356500.

The previous prime is 20192153. The next prime is 20192167. The reversal of 20192161 is 16129102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20192161 - 2³ = 20192153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20192167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 917815 + ... + 917836.

It is an arithmetic number, because the mean of its divisors is an integer number (5506956).

Almost surely, 2^20192161 is an apocalyptic number.

It is an amenable number.

20192161 is a deficient number, since it is larger than the sum of its proper divisors (1835663).

20192161 is a wasteful number, since it uses less digits than its factorization.

20192161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835662.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 20192161 is about 4493.5688489218. The cubic root of 20192161 is about 272.3083342055.

The spelling of 20192161 in words is "twenty million, one hundred ninety-two thousand, one hundred sixty-one".