19899663 has 8 divisors (see below), whose sum is σ = 30323328. Its totient is φ = 11371224.

The previous prime is 19899653. The next prime is 19899679. The reversal of 19899663 is 36699891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19899663 - 2¹⁰ = 19898639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19899653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473781 + ... + 473822.

It is an arithmetic number, because the mean of its divisors is an integer number (3790416).

Almost surely, 2^19899663 is an apocalyptic number.

19899663 is a deficient number, since it is larger than the sum of its proper divisors (10423665).

19899663 is an equidigital number, since it uses as much as digits as its factorization.

19899663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947613.

The product of its digits is 629856, while the sum is 51.

The square root of 19899663 is about 4460.9038321847. The cubic root of 19899663 is about 270.9870729072.

The spelling of 19899663 in words is "nineteen million, eight hundred ninety-nine thousand, six hundred sixty-three".