20013171773500 has 96 divisors (see below), whose sum is σ = 45222181804800. Its totient is φ = 7728162444800.

The previous prime is 20013171773461. The next prime is 20013171773501. The reversal of 20013171773500 is 537717131002.

It is a self number, because there is not a number n which added to its sum of digits gives 20013171773500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013171773501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109775421 + ... + 109957579.

It is an arithmetic number, because the mean of its divisors is an integer number (471064393800).

Almost surely, 2^{20013171773500} is an apocalyptic number.

20013171773500 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 20013171773500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22611090902400).

20013171773500 is an abundant number, since it is smaller than the sum of its proper divisors (25209010031300).

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

20013171773500 is a wasteful number, since it uses less digits than its factorization.

20013171773500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189784 (or 189772 counting only the distinct ones).

The product of its (nonzero) digits is 30870, while the sum is 37.

The spelling of 20013171773500 in words is "twenty trillion, thirteen billion, one hundred seventy-one million, seven hundred seventy-three thousand, five hundred".