20741969791 has 2 divisors, whose sum is σ = 20741969792. Its totient is φ = 20741969790.

The previous prime is 20741969777. The next prime is 20741969803. The reversal of 20741969791 is 19796914702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20741969791 - 2⁷ = 20741969663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20741969701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370984895 + 10370984896.

It is an arithmetic number, because the mean of its divisors is an integer number (10370984896).

Almost surely, 2^20741969791 is an apocalyptic number.

20741969791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20741969791 is an equidigital number, since it uses as much as digits as its factorization.

20741969791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The spelling of 20741969791 in words is "twenty billion, seven hundred forty-one million, nine hundred sixty-nine thousand, seven hundred ninety-one".