19799664 has 20 divisors (see below), whose sum is σ = 51149256. Its totient is φ = 6599872.

The previous prime is 19799657. The next prime is 19799671. The reversal of 19799664 is 46699791.

It is an interprime number because it is at equal distance from previous prime (19799657) and next prime (19799671).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206199 + ... + 206294.

Almost surely, 2^19799664 is an apocalyptic number.

It is an amenable number.

19799664 is an abundant number, since it is smaller than the sum of its proper divisors (31349592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19799664 is a wasteful number, since it uses less digits than its factorization.

19799664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412504 (or 412498 counting only the distinct ones).

The product of its digits is 734832, while the sum is 51.

The square root of 19799664 is about 4449.6813369049. The cubic root of 19799664 is about 270.5323925980.

The spelling of 19799664 in words is "nineteen million, seven hundred ninety-nine thousand, six hundred sixty-four".