20871717507 has 6 divisors (see below), whose sum is σ = 30148036412. Its totient is φ = 13914478332.

The previous prime is 20871717487. The next prime is 20871717527. The reversal of 20871717507 is 70571717802.

It is a happy number.

20871717507 is a `hidden beast` number, since 2 + 0 + 8 + 71 + 71 + 7 + 507 = 666.

It is an interprime number because it is at equal distance from previous prime (20871717487) and next prime (20871717527).

It is not a de Polignac number, because 20871717507 - 2⁶ = 20871717443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20871717527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1159539853 + ... + 1159539870.

Almost surely, 2^20871717507 is an apocalyptic number.

20871717507 is a deficient number, since it is larger than the sum of its proper divisors (9276318905).

20871717507 is a wasteful number, since it uses less digits than its factorization.

20871717507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319079729 (or 2319079726 counting only the distinct ones).

The product of its (nonzero) digits is 192080, while the sum is 45.

The spelling of 20871717507 in words is "twenty billion, eight hundred seventy-one million, seven hundred seventeen thousand, five hundred seven".