20624642191 has 2 divisors, whose sum is σ = 20624642192. Its totient is φ = 20624642190.

The previous prime is 20624642081. The next prime is 20624642251. The reversal of 20624642191 is 19124642602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20624642191 - 2¹¹ = 20624640143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20624642191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20624649191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10312321095 + 10312321096.

It is an arithmetic number, because the mean of its divisors is an integer number (10312321096).

Almost surely, 2^20624642191 is an apocalyptic number.

20624642191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20624642191 is an equidigital number, since it uses as much as digits as its factorization.

20624642191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 20624642191 in words is "twenty billion, six hundred twenty-four million, six hundred forty-two thousand, one hundred ninety-one".