19996499 has 4 divisors (see below), whose sum is σ = 20865936. Its totient is φ = 19127064.

The previous prime is 19996489. The next prime is 19996513. The reversal of 19996499 is 99469991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19996499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19996409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434684 + ... + 434729.

It is an arithmetic number, because the mean of its divisors is an integer number (5216484).

Almost surely, 2^19996499 is an apocalyptic number.

19996499 is a deficient number, since it is larger than the sum of its proper divisors (869437).

19996499 is an equidigital number, since it uses as much as digits as its factorization.

19996499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869436.

The product of its digits is 1417176, while the sum is 56.

The square root of 19996499 is about 4471.7445141689. The cubic root of 19996499 is about 271.4259221084.

The spelling of 19996499 in words is "nineteen million, nine hundred ninety-six thousand, four hundred ninety-nine".