20716287191 has 2 divisors, whose sum is σ = 20716287192. Its totient is φ = 20716287190.

The previous prime is 20716287169. The next prime is 20716287211. The reversal of 20716287191 is 19178261702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20716287191 - 2⁶ = 20716287127 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20716287101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10358143595 + 10358143596.

It is an arithmetic number, because the mean of its divisors is an integer number (10358143596).

Almost surely, 2^20716287191 is an apocalyptic number.

20716287191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20716287191 is an equidigital number, since it uses as much as digits as its factorization.

20716287191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 44.

The spelling of 20716287191 in words is "twenty billion, seven hundred sixteen million, two hundred eighty-seven thousand, one hundred ninety-one".