20317781359 has 4 divisors (see below), whose sum is σ = 20318068480. Its totient is φ = 20317494240.

The previous prime is 20317781329. The next prime is 20317781389. The reversal of 20317781359 is 95318771302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (20317781329) and next prime (20317781389).

It is a cyclic number.

It is not a de Polignac number, because 20317781359 - 2⁵ = 20317781327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317781329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46162 + ... + 206800.

It is an arithmetic number, because the mean of its divisors is an integer number (5079517120).

Almost surely, 2^20317781359 is an apocalyptic number.

20317781359 is a deficient number, since it is larger than the sum of its proper divisors (287121).

20317781359 is a wasteful number, since it uses less digits than its factorization.

20317781359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287120.

The product of its (nonzero) digits is 317520, while the sum is 46.

The spelling of 20317781359 in words is "twenty billion, three hundred seventeen million, seven hundred eighty-one thousand, three hundred fifty-nine".