181843980020 has 12 divisors (see below), whose sum is σ = 381872358084. Its totient is φ = 72737592000.

The previous prime is 181843979963. The next prime is 181843980061. The reversal of 181843980020 is 20089348181.

It can be written as a sum of positive squares in 2 ways, for example, as 68982921316 + 112861058704 = 262646^2 + 335948^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4546099481 + ... + 4546099520.

It is an arithmetic number, because the mean of its divisors is an integer number (31822696507).

Almost surely, 2^181843980020 is an apocalyptic number.

181843980020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181843980020 is an abundant number, since it is smaller than the sum of its proper divisors (200028378064).

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

181843980020 is a wasteful number, since it uses less digits than its factorization.

181843980020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9092199010 (or 9092199008 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 181843980020 in words is "one hundred eighty-one billion, eight hundred forty-three million, nine hundred eighty thousand, twenty".