20847995538600 has 192 divisors, whose sum is σ = 65468346811200. Its totient is φ = 5487620474880.

The previous prime is 20847995538599. The next prime is 20847995538679. The reversal of 20847995538600 is 683559974802.

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, 17197236 + ... + 18369564.

It is an arithmetic number, because the mean of its divisors is an integer number (340980972975).

Almost surely, 2^{20847995538600} is an apocalyptic number.

20847995538600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20847995538600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32734173405600).

20847995538600 is an abundant number, since it is smaller than the sum of its proper divisors (44620351272600).

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

20847995538600 is a wasteful number, since it uses less digits than its factorization.

20847995538600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172732 (or 1172723 counting only the distinct ones).

The product of its (nonzero) digits is 130636800, while the sum is 66.

The spelling of 20847995538600 in words is "twenty trillion, eight hundred forty-seven billion, nine hundred ninety-five million, five hundred thirty-eight thousand, six hundred".