19689872 has 20 divisors (see below), whose sum is σ = 39037680. Its totient is φ = 9615648.

The previous prime is 19689853. The next prime is 19689877. The reversal of 19689872 is 27898691.

It is a self number, because there is not a number n which added to its sum of digits gives 19689872.

It is not an unprimeable number, because it can be changed into a prime (19689877) 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, 13622 + ... + 14997.

It is an arithmetic number, because the mean of its divisors is an integer number (1951884).

Almost surely, 2^19689872 is an apocalyptic number.

It is an amenable number.

19689872 is a deficient number, since it is larger than the sum of its proper divisors (19347808).

19689872 is a wasteful number, since it uses less digits than its factorization.

19689872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28670 (or 28664 counting only the distinct ones).

The product of its digits is 435456, while the sum is 50.

The square root of 19689872 is about 4437.3271233931. The cubic root of 19689872 is about 270.0314183832.

The spelling of 19689872 in words is "nineteen million, six hundred eighty-nine thousand, eight hundred seventy-two".