181840020020 has 24 divisors (see below), whose sum is σ = 381984220968. Its totient is φ = 72713116800.

The previous prime is 181840019989. The next prime is 181840020023. The reversal of 181840020020 is 20020048181.

It can be written as a sum of positive squares in 4 ways, for example, as 25786578724 + 156053441296 = 160582^2 + 395036^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181840020023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1365491 + ... + 1492730.

It is an arithmetic number, because the mean of its divisors is an integer number (15916009207).

Almost surely, 2^181840020020 is an apocalyptic number.

181840020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181840020020 is an abundant number, since it is smaller than the sum of its proper divisors (200144200948).

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

181840020020 is a wasteful number, since it uses less digits than its factorization.

181840020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2861411 (or 2861409 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The spelling of 181840020020 in words is "one hundred eighty-one billion, eight hundred forty million, twenty thousand, twenty".