19605994 has 4 divisors (see below), whose sum is σ = 29408994. Its totient is φ = 9802996.

The previous prime is 19605923. The next prime is 19605997. The reversal of 19605994 is 49950691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49950691 = 7 ⋅7135813.

It can be written as a sum of positive squares in only one way, i.e., 15705369 + 3900625 = 3963^2 + 1975^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19605994.

It is not an unprimeable number, because it can be changed into a prime (19605997) 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 as a sum of consecutive naturals, namely, 4901497 + ... + 4901500.

Almost surely, 2^19605994 is an apocalyptic number.

19605994 is a deficient number, since it is larger than the sum of its proper divisors (9803000).

19605994 is an equidigital number, since it uses as much as digits as its factorization.

19605994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9802999.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 19605994 is about 4427.8656257841. The cubic root of 19605994 is about 269.6474319039.

The spelling of 19605994 in words is "nineteen million, six hundred five thousand, nine hundred ninety-four".