19908693 has 16 divisors (see below), whose sum is σ = 33708160. Its totient is φ = 11376288.

The previous prime is 19908689. The next prime is 19908697. The reversal of 19908693 is 39680991.

It is an interprime number because it is at equal distance from previous prime (19908689) and next prime (19908697).

It is not a de Polignac number, because 19908693 - 2² = 19908689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19908697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52480 + ... + 52857.

It is an arithmetic number, because the mean of its divisors is an integer number (2106760).

Almost surely, 2^19908693 is an apocalyptic number.

It is an amenable number.

19908693 is a deficient number, since it is larger than the sum of its proper divisors (13799467).

19908693 is a wasteful number, since it uses less digits than its factorization.

19908693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105353 (or 105347 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 19908693 is about 4461.9158441190. The cubic root of 19908693 is about 271.0280558999.

The spelling of 19908693 in words is "nineteen million, nine hundred eight thousand, six hundred ninety-three".