20136191 has 4 divisors (see below), whose sum is σ = 20331792. Its totient is φ = 19940592.

The previous prime is 20136187. The next prime is 20136197. The reversal of 20136191 is 19163102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20136191 - 2² = 20136187 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 (20136197) 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, 97646 + ... + 97851.

It is an arithmetic number, because the mean of its divisors is an integer number (5082948).

Almost surely, 2^20136191 is an apocalyptic number.

20136191 is a deficient number, since it is larger than the sum of its proper divisors (195601).

20136191 is a wasteful number, since it uses less digits than its factorization.

20136191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195600.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 20136191 is about 4487.3367379772. The cubic root of 20136191 is about 272.0565004816.

Adding to 20136191 its reverse (19163102), we get a palindrome (39299293).

The spelling of 20136191 in words is "twenty million, one hundred thirty-six thousand, one hundred ninety-one".