20517116512 has 96 divisors (see below), whose sum is σ = 42979507200. Its totient is φ = 9620835840.

The previous prime is 20517116461. The next prime is 20517116537. The reversal of 20517116512 is 21561171502.

It is a super-2 number, since 2×20517116512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10397958 + ... + 10399930.

It is an arithmetic number, because the mean of its divisors is an integer number (447703200).

Almost surely, 2^20517116512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20517116512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21489753600).

20517116512 is an abundant number, since it is smaller than the sum of its proper divisors (22462390688).

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

20517116512 is a wasteful number, since it uses less digits than its factorization.

20517116512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276 (or 2268 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 20517116512 in words is "twenty billion, five hundred seventeen million, one hundred sixteen thousand, five hundred twelve".