19996 has 6 divisors (see below), whose sum is σ = 35000. Its totient is φ = 9996.

The previous prime is 19993. The next prime is 19997. The reversal of 19996 is 69991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2496 + ... + 2503.

2¹⁹⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

19996 is a deficient number, since it is larger than the sum of its proper divisors (15004).

19996 is a wasteful number, since it uses less digits than its factorization.

19996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5003 (or 5001 counting only the distinct ones).

The product of its digits is 4374, while the sum is 34.

The square root of 19996 is about 141.4072133945. The cubic root of 19996 is about 27.1423664336.

The spelling of 19996 in words is "nineteen thousand, nine hundred ninety-six".