20317597207993 has 4 divisors (see below), whose sum is σ = 20790099468688. Its totient is φ = 19845094947300.

The previous prime is 20317597207991. The next prime is 20317597208039. The reversal of 20317597207993 is 39970279571302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20317597207993 - 2¹ = 20317597207991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20317597207991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236251130283 + ... + 236251130368.

It is an arithmetic number, because the mean of its divisors is an integer number (5197524867172).

Almost surely, 2^{20317597207993} is an apocalyptic number.

It is an amenable number.

20317597207993 is a deficient number, since it is larger than the sum of its proper divisors (472502260695).

20317597207993 is an equidigital number, since it uses as much as digits as its factorization.

20317597207993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472502260694.

The product of its (nonzero) digits is 45008460, while the sum is 64.

The spelling of 20317597207993 in words is "twenty trillion, three hundred seventeen billion, five hundred ninety-seven million, two hundred seven thousand, nine hundred ninety-three".