19944081 has 12 divisors (see below), whose sum is σ = 29511300. Its totient is φ = 12971520.

The previous prime is 19944061. The next prime is 19944107. The reversal of 19944081 is 18044991.

It can be written as a sum of positive squares in 2 ways, for example, as 10890000 + 9054081 = 3300^2 + 3009^2 .

It is not a de Polignac number, because 19944081 - 2⁹ = 19943569 is a prime.

It is a super-2 number, since 2×19944081² = 795532733869122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19944061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26656 + ... + 27393.

It is an arithmetic number, because the mean of its divisors is an integer number (2459275).

Almost surely, 2^19944081 is an apocalyptic number.

It is an amenable number.

19944081 is a deficient number, since it is larger than the sum of its proper divisors (9567219).

19944081 is a wasteful number, since it uses less digits than its factorization.

19944081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54096 (or 54093 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 19944081 is about 4465.8796445941. The cubic root of 19944081 is about 271.1885463223.

The spelling of 19944081 in words is "nineteen million, nine hundred forty-four thousand, eighty-one".