20497709049743 has 2 divisors, whose sum is σ = 20497709049744. Its totient is φ = 20497709049742.

The previous prime is 20497709049707. The next prime is 20497709049761. The reversal of 20497709049743 is 34794090779402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20497709049743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20497709049743.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20497709049793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10248854524871 + 10248854524872.

It is an arithmetic number, because the mean of its divisors is an integer number (10248854524872).

Almost surely, 2^{20497709049743} is an apocalyptic number.

20497709049743 is a deficient number, since it is larger than the sum of its proper divisors (1).

20497709049743 is an equidigital number, since it uses as much as digits as its factorization.

20497709049743 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96018048, while the sum is 65.

The spelling of 20497709049743 in words is "twenty trillion, four hundred ninety-seven billion, seven hundred nine million, forty-nine thousand, seven hundred forty-three".