20317347281 has 12 divisors (see below), whose sum is σ = 25522619136. Its totient is φ = 15831698520.

The previous prime is 20317347257. The next prime is 20317347283. The reversal of 20317347281 is 18274371302.

It is not a de Polignac number, because 20317347281 - 2⁶ = 20317347217 is a prime.

It is a super-2 number, since 2×20317347281² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20317347283) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11992865 + ... + 11994558.

It is an arithmetic number, because the mean of its divisors is an integer number (2126884928).

Almost surely, 2^20317347281 is an apocalyptic number.

It is an amenable number.

20317347281 is a deficient number, since it is larger than the sum of its proper divisors (5205271855).

20317347281 is a wasteful number, since it uses less digits than its factorization.

20317347281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23987452 (or 23987441 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 20317347281 in words is "twenty billion, three hundred seventeen million, three hundred forty-seven thousand, two hundred eighty-one".