19944881 has 8 divisors (see below), whose sum is σ = 21925728. Its totient is φ = 17992000.

The previous prime is 19944877. The next prime is 19944913. The reversal of 19944881 is 18844991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19944881 - 2² = 19944877 is a prime.

It is a super-2 number, since 2×19944881² = 795596556208322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19944481) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5480 + ... + 8361.

It is an arithmetic number, because the mean of its divisors is an integer number (2740716).

Almost surely, 2^19944881 is an apocalyptic number.

19944881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19944881 is a deficient number, since it is larger than the sum of its proper divisors (1980847).

19944881 is a wasteful number, since it uses less digits than its factorization.

19944881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13983.

The product of its digits is 82944, while the sum is 44.

The square root of 19944881 is about 4465.9692117165. The cubic root of 19944881 is about 271.1921722592.

The spelling of 19944881 in words is "nineteen million, nine hundred forty-four thousand, eight hundred eighty-one".