19981072 has 20 divisors (see below), whose sum is σ = 38814480. Its totient is φ = 9964448.

The previous prime is 19981061. The next prime is 19981079. The reversal of 19981072 is 27018991.

It is not an unprimeable number, because it can be changed into a prime (19981079) 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, 5679 + ... + 8497.

It is an arithmetic number, because the mean of its divisors is an integer number (1940724).

Almost surely, 2^19981072 is an apocalyptic number.

It is an amenable number.

19981072 is a deficient number, since it is larger than the sum of its proper divisors (18833408).

19981072 is a wasteful number, since it uses less digits than its factorization.

19981072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270 (or 3264 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 19981072 is about 4470.0192393322. The cubic root of 19981072 is about 271.3561038039.

The spelling of 19981072 in words is "nineteen million, nine hundred eighty-one thousand, seventy-two".