20317259643 has 8 divisors (see below), whose sum is σ = 27090464256. Its totient is φ = 13544447400.

The previous prime is 20317259639. The next prime is 20317259801. The reversal of 20317259643 is 34695271302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20317259643 - 2² = 20317259639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20317259595 and 20317259604.

It is not an unprimeable number, because it can be changed into a prime (20317259143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58398 + ... + 209868.

It is an arithmetic number, because the mean of its divisors is an integer number (3386308032).

Almost surely, 2^20317259643 is an apocalyptic number.

20317259643 is a deficient number, since it is larger than the sum of its proper divisors (6773204613).

20317259643 is a wasteful number, since it uses less digits than its factorization.

20317259643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196185.

The product of its (nonzero) digits is 272160, while the sum is 42.

The spelling of 20317259643 in words is "twenty billion, three hundred seventeen million, two hundred fifty-nine thousand, six hundred forty-three".