19993678 has 8 divisors (see below), whose sum is σ = 30401568. Its totient is φ = 9859824.

The previous prime is 19993669. The next prime is 19993709. The reversal of 19993678 is 87639991.

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

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, 68326 + ... + 68617.

It is an arithmetic number, because the mean of its divisors is an integer number (3800196).

Almost surely, 2^19993678 is an apocalyptic number.

19993678 is a deficient number, since it is larger than the sum of its proper divisors (10407890).

19993678 is a wasteful number, since it uses less digits than its factorization.

19993678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137018.

The product of its digits is 734832, while the sum is 52.

The square root of 19993678 is about 4471.4290780465. The cubic root of 19993678 is about 271.4131577318.

The spelling of 19993678 in words is "nineteen million, nine hundred ninety-three thousand, six hundred seventy-eight".