19996799 has 4 divisors (see below), whose sum is σ = 20018736. Its totient is φ = 19974864.

The previous prime is 19996793. The next prime is 19996831. The reversal of 19996799 is 99769991.

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

It is a cyclic number.

It is not a de Polignac number, because 19996799 - 2⁴ = 19996783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19996793) 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, 9539 + ... + 11444.

It is an arithmetic number, because the mean of its divisors is an integer number (5004684).

Almost surely, 2^19996799 is an apocalyptic number.

19996799 is a deficient number, since it is larger than the sum of its proper divisors (21937).

19996799 is an equidigital number, since it uses as much as digits as its factorization.

19996799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21936.

The product of its digits is 2480058, while the sum is 59.

The square root of 19996799 is about 4471.7780579989. The cubic root of 19996799 is about 271.4272794689.

The spelling of 19996799 in words is "nineteen million, nine hundred ninety-six thousand, seven hundred ninety-nine".