20317245943 has 4 divisors (see below), whose sum is σ = 20463413320. Its totient is φ = 20171078568.

The previous prime is 20317245929. The next prime is 20317245997. The reversal of 20317245943 is 34954271302.

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

It is a cyclic number.

It is not a de Polignac number, because 20317245943 - 2²⁵ = 20283691511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20317245896 and 20317245905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317245743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73083480 + ... + 73083757.

It is an arithmetic number, because the mean of its divisors is an integer number (5115853330).

Almost surely, 2^20317245943 is an apocalyptic number.

20317245943 is a deficient number, since it is larger than the sum of its proper divisors (146167377).

20317245943 is a wasteful number, since it uses less digits than its factorization.

20317245943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146167376.

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 20317245943 in words is "twenty billion, three hundred seventeen million, two hundred forty-five thousand, nine hundred forty-three".