20089779791 has 2 divisors, whose sum is σ = 20089779792. Its totient is φ = 20089779790.

The previous prime is 20089779673. The next prime is 20089779839. The reversal of 20089779791 is 19797798002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20089779791 - 2¹⁰ = 20089778767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20089779791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20089779191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10044889895 + 10044889896.

It is an arithmetic number, because the mean of its divisors is an integer number (10044889896).

Almost surely, 2^20089779791 is an apocalyptic number.

20089779791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20089779791 is an equidigital number, since it uses as much as digits as its factorization.

20089779791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000752, while the sum is 59.

The spelling of 20089779791 in words is "twenty billion, eighty-nine million, seven hundred seventy-nine thousand, seven hundred ninety-one".