19681696 has 12 divisors (see below), whose sum is σ = 38748402. Its totient is φ = 9840832.

The previous prime is 19681693. The next prime is 19681703. The reversal of 19681696 is 69618691.

It can be written as a sum of positive squares in only one way, i.e., 19678096 + 3600 = 4436^2 + 60^2 .

It is not an unprimeable number, because it can be changed into a prime (19681693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307495 + ... + 307558.

Almost surely, 2^19681696 is an apocalyptic number.

19681696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19681696 is a deficient number, since it is larger than the sum of its proper divisors (19066706).

19681696 is an equidigital number, since it uses as much as digits as its factorization.

19681696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615063 (or 615055 counting only the distinct ones).

The product of its digits is 139968, while the sum is 46.

The square root of 19681696 is about 4436.4057524081. The cubic root of 19681696 is about 269.9940373626.

The spelling of 19681696 in words is "nineteen million, six hundred eighty-one thousand, six hundred ninety-six".