20320637191 has 2 divisors, whose sum is σ = 20320637192. Its totient is φ = 20320637190.

The previous prime is 20320637153. The next prime is 20320637257. The reversal of 20320637191 is 19173602302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20320637191 - 2⁷ = 20320637063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20320637291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160318595 + 10160318596.

It is an arithmetic number, because the mean of its divisors is an integer number (10160318596).

Almost surely, 2^20320637191 is an apocalyptic number.

20320637191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320637191 is an equidigital number, since it uses as much as digits as its factorization.

20320637191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The spelling of 20320637191 in words is "twenty billion, three hundred twenty million, six hundred thirty-seven thousand, one hundred ninety-one".