19985180 has 48 divisors (see below), whose sum is σ = 43666560. Its totient is φ = 7676928.

The previous prime is 19985179. The next prime is 19985191. The reversal of 19985180 is 8158991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83501 + ... + 83739.

It is an arithmetic number, because the mean of its divisors is an integer number (909720).

Almost surely, 2^19985180 is an apocalyptic number.

19985180 is a gapful number since it is divisible by the number (10) 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 19985180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21833280).

19985180 is an abundant number, since it is smaller than the sum of its proper divisors (23681380).

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

19985180 is a wasteful number, since it uses less digits than its factorization.

19985180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 19985180 is about 4470.4787215689. The cubic root of 19985180 is about 271.3746989771.

The spelling of 19985180 in words is "nineteen million, nine hundred eighty-five thousand, one hundred eighty".