181870020 has 72 divisors (see below), whose sum is σ = 570711960. Its totient is φ = 46824960.

The previous prime is 181870019. The next prime is 181870043. The reversal of 181870020 is 20078181.

It can be written as a sum of positive squares in 4 ways, for example, as 3326976 + 178543044 = 1824^2 + 13362^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12201 + ... + 22640.

It is an arithmetic number, because the mean of its divisors is an integer number (7926555).

Almost surely, 2^181870020 is an apocalyptic number.

181870020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181870020 is an abundant number, since it is smaller than the sum of its proper divisors (388841940).

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

181870020 is a wasteful number, since it uses less digits than its factorization.

181870020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34885 (or 34880 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 181870020 is about 13485.9193235018. The cubic root of 181870020 is about 566.5701696508.

The spelling of 181870020 in words is "one hundred eighty-one million, eight hundred seventy thousand, twenty".