19887044 has 12 divisors (see below), whose sum is σ = 34907964. Its totient is φ = 9913344.

The previous prime is 19887041. The next prime is 19887061. The reversal of 19887044 is 44078891.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7496644 + 12390400 = 2738^2 + 3520^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19886992 and 19887010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19887041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6029 + ... + 8724.

It is an arithmetic number, because the mean of its divisors is an integer number (2908997).

Almost surely, 2^19887044 is an apocalyptic number.

It is an amenable number.

19887044 is a deficient number, since it is larger than the sum of its proper divisors (15020920).

19887044 is a wasteful number, since it uses less digits than its factorization.

19887044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15094 (or 15092 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 19887044 is about 4459.4892084184. The cubic root of 19887044 is about 270.9297803298.

The spelling of 19887044 in words is "nineteen million, eight hundred eighty-seven thousand, forty-four".