20678241593 has 2 divisors, whose sum is σ = 20678241594. Its totient is φ = 20678241592.

The previous prime is 20678241527. The next prime is 20678241613. The reversal of 20678241593 is 39514287602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17622031504 + 3056210089 = 132748^2 + 55283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20678241593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20678241293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339120796 + 10339120797.

It is an arithmetic number, because the mean of its divisors is an integer number (10339120797).

It is a 1-persistent number, because it is pandigital, but 2⋅20678241593 = 41356483186 is not.

Almost surely, 2^20678241593 is an apocalyptic number.

It is an amenable number.

20678241593 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678241593 is an equidigital number, since it uses as much as digits as its factorization.

20678241593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 20678241593 in words is "twenty billion, six hundred seventy-eight million, two hundred forty-one thousand, five hundred ninety-three".