19997608 has 16 divisors (see below), whose sum is σ = 37656000. Its totient is φ = 9956016.

The previous prime is 19997599. The next prime is 19997609. The reversal of 19997608 is 80679991.

It is not an unprimeable number, because it can be changed into a prime (19997609) 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, 3318 + ... + 7141.

It is an arithmetic number, because the mean of its divisors is an integer number (2353500).

Almost surely, 2^19997608 is an apocalyptic number.

It is an amenable number.

19997608 is a deficient number, since it is larger than the sum of its proper divisors (17658392).

19997608 is a wasteful number, since it uses less digits than its factorization.

19997608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10704 (or 10700 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 19997608 is about 4471.8685132727. The cubic root of 19997608 is about 271.4309397498.

The spelling of 19997608 in words is "nineteen million, nine hundred ninety-seven thousand, six hundred eight".