20201010191 has 4 divisors (see below), whose sum is σ = 20477736432. Its totient is φ = 19924283952.

The previous prime is 20201010187. The next prime is 20201010199. The reversal of 20201010191 is 19101010202.

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 20201010191 - 2² = 20201010187 is a prime.

It is a super-3 number, since 3×20201010191³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201010199) 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, 138363011 + ... + 138363156.

It is an arithmetic number, because the mean of its divisors is an integer number (5119434108).

Almost surely, 2^20201010191 is an apocalyptic number.

20201010191 is a deficient number, since it is larger than the sum of its proper divisors (276726241).

20201010191 is an equidigital number, since it uses as much as digits as its factorization.

20201010191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276726240.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 20201010191 its reverse (19101010202), we get a palindrome (39302020393).

The spelling of 20201010191 in words is "twenty billion, two hundred one million, ten thousand, one hundred ninety-one".