19999180 has 12 divisors (see below), whose sum is σ = 41998320. Its totient is φ = 7999664.

The previous prime is 19999159. The next prime is 19999193. The reversal of 19999180 is 8199991.

It is a self number, because there is not a number n which added to its sum of digits gives 19999180.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499960 + ... + 499999.

It is an arithmetic number, because the mean of its divisors is an integer number (3499860).

Almost surely, 2^19999180 is an apocalyptic number.

19999180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19999180 is an abundant number, since it is smaller than the sum of its proper divisors (21999140).

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

19999180 is a wasteful number, since it uses less digits than its factorization.

19999180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999968 (or 999966 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 19999180 is about 4472.0442752728. The cubic root of 19999180 is about 271.4380519047.

The spelling of 19999180 in words is "nineteen million, nine hundred ninety-nine thousand, one hundred eighty".