19953994 has 8 divisors (see below), whose sum is σ = 30048228. Its totient is φ = 9937920.

The previous prime is 19953979. The next prime is 19954027. The reversal of 19953994 is 49935991.

It can be written as a sum of positive squares in 2 ways, for example, as 17114769 + 2839225 = 4137^2 + 1685^2 .

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

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 in 3 ways as a sum of consecutive naturals, for example, 18897 + ... + 19924.

Almost surely, 2^19953994 is an apocalyptic number.

19953994 is a deficient number, since it is larger than the sum of its proper divisors (10094234).

19953994 is a wasteful number, since it uses less digits than its factorization.

19953994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39080.

The product of its digits is 393660, while the sum is 49.

The square root of 19953994 is about 4466.9893664525. The cubic root of 19953994 is about 271.2334693714.

The spelling of 19953994 in words is "nineteen million, nine hundred fifty-three thousand, nine hundred ninety-four".