180020810838 has 64 divisors (see below), whose sum is σ = 398438383104. Its totient is φ = 53765376000.

The previous prime is 180020810821. The next prime is 180020810863. The reversal of 180020810838 is 838018020081.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 180020810796 and 180020810805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21893568 + ... + 21901788.

It is an arithmetic number, because the mean of its divisors is an integer number (6225599736).

Almost surely, 2^180020810838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 180020810838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199219191552).

180020810838 is an abundant number, since it is smaller than the sum of its proper divisors (218417572266).

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

180020810838 is a wasteful number, since it uses less digits than its factorization.

180020810838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12981.

The product of its (nonzero) digits is 24576, while the sum is 39.

The spelling of 180020810838 in words is "one hundred eighty billion, twenty million, eight hundred ten thousand, eight hundred thirty-eight".