19981144 has 16 divisors (see below), whose sum is σ = 37587600. Its totient is φ = 9957792.

The previous prime is 19981139. The next prime is 19981151. The reversal of 19981144 is 44118991.

It is a super-2 number, since 2×19981144² = 798492231097472, which contains 22 as substring.

It is a congruent number.

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, 1404 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (2349225).

Almost surely, 2^19981144 is an apocalyptic number.

It is an amenable number.

19981144 is a deficient number, since it is larger than the sum of its proper divisors (17606456).

19981144 is a wasteful number, since it uses less digits than its factorization.

19981144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8202 (or 8198 counting only the distinct ones).

The product of its digits is 10368, while the sum is 37.

The square root of 19981144 is about 4470.0272929816. The cubic root of 19981144 is about 271.3564297393.

The spelling of 19981144 in words is "nineteen million, nine hundred eighty-one thousand, one hundred forty-four".