20593908785 has 4 divisors (see below), whose sum is σ = 24712690548. Its totient is φ = 16475127024.

The previous prime is 20593908779. The next prime is 20593908799. The reversal of 20593908785 is 58780939502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14021401744 + 6572507041 = 118412^2 + 81071^2 .

It is a cyclic number.

It is not a de Polignac number, because 20593908785 - 2⁸ = 20593908529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20593908785.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2059390874 + ... + 2059390883.

It is an arithmetic number, because the mean of its divisors is an integer number (6178172637).

Almost surely, 2^20593908785 is an apocalyptic number.

It is an amenable number.

20593908785 is a deficient number, since it is larger than the sum of its proper divisors (4118781763).

20593908785 is an equidigital number, since it uses as much as digits as its factorization.

20593908785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4118781762.

The product of its (nonzero) digits is 5443200, while the sum is 56.

The spelling of 20593908785 in words is "twenty billion, five hundred ninety-three million, nine hundred eight thousand, seven hundred eighty-five".