20497709049759 has 12 divisors (see below), whose sum is σ = 29611557968616. Its totient is φ = 13663405824432.

The previous prime is 20497709049743. The next prime is 20497709049761. The reversal of 20497709049759 is 95794090779402.

20497709049759 is a `hidden beast` number, since 2 + 0 + 49 + 7 + 7 + 0 + 90 + 497 + 5 + 9 = 666.

It is not a de Polignac number, because 20497709049759 - 2⁴ = 20497709049743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20497709049799) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144386952 + ... + 144528845.

It is an arithmetic number, because the mean of its divisors is an integer number (2467629830718).

Almost surely, 2^{20497709049759} is an apocalyptic number.

20497709049759 is a deficient number, since it is larger than the sum of its proper divisors (9113848918857).

20497709049759 is a wasteful number, since it uses less digits than its factorization.

20497709049759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288923686 (or 288923683 counting only the distinct ones).

The product of its (nonzero) digits is 360067680, while the sum is 72.

The spelling of 20497709049759 in words is "twenty trillion, four hundred ninety-seven billion, seven hundred nine million, forty-nine thousand, seven hundred fifty-nine".