19994066 has 4 divisors (see below), whose sum is σ = 29991102. Its totient is φ = 9997032.

The previous prime is 19994059. The next prime is 19994077. The reversal of 19994066 is 66049991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19989841 + 4225 = 4471^2 + 65^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998515 + ... + 4998518.

Almost surely, 2^19994066 is an apocalyptic number.

19994066 is a deficient number, since it is larger than the sum of its proper divisors (9997036).

19994066 is an equidigital number, since it uses as much as digits as its factorization.

19994066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9997035.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 19994066 is about 4471.4724644126. The cubic root of 19994066 is about 271.4149134138.

The spelling of 19994066 in words is "nineteen million, nine hundred ninety-four thousand, sixty-six".