20090856760693 has 2 divisors, whose sum is σ = 20090856760694. Its totient is φ = 20090856760692.

The previous prime is 20090856760691. The next prime is 20090856760771. The reversal of 20090856760693 is 39606765809002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12457560843729 + 7633295916964 = 3529527^2 + 2762842^2 .

It is a cyclic number.

It is not a de Polignac number, because 20090856760693 - 2¹ = 20090856760691 is a prime.

Together with 20090856760691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20090856760691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10045428380346 + 10045428380347.

It is an arithmetic number, because the mean of its divisors is an integer number (10045428380347).

Almost surely, 2^{20090856760693} is an apocalyptic number.

It is an amenable number.

20090856760693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20090856760693 is an equidigital number, since it uses as much as digits as its factorization.

20090856760693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29393280, while the sum is 61.

The spelling of 20090856760693 in words is "twenty trillion, ninety billion, eight hundred fifty-six million, seven hundred sixty thousand, six hundred ninety-three".