20717122206 has 96 divisors (see below), whose sum is σ = 46622096640. Its totient is φ = 6131002240.

The previous prime is 20717122171. The next prime is 20717122213. The reversal of 20717122206 is 60222171702.

It is a super-5 number, since 5×20717122206⁵ (a number of 53 digits) contains 55555 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5361031 + ... + 5364893.

It is an arithmetic number, because the mean of its divisors is an integer number (485646840).

Almost surely, 2^20717122206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20717122206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23311048320).

20717122206 is an abundant number, since it is smaller than the sum of its proper divisors (25904974434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20717122206 is a wasteful number, since it uses less digits than its factorization.

20717122206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062 (or 4051 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

Adding to 20717122206 its reverse (60222171702), we get a palindrome (80939293908).

The spelling of 20717122206 in words is "twenty billion, seven hundred seventeen million, one hundred twenty-two thousand, two hundred six".