19604945 has 4 divisors (see below), whose sum is σ = 23525940. Its totient is φ = 15683952.

The previous prime is 19604939. The next prime is 19604951. The reversal of 19604945 is 54940691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54940691 = 13 ⋅4226207.

It is an interprime number because it is at equal distance from previous prime (19604939) and next prime (19604951).

It can be written as a sum of positive squares in 2 ways, for example, as 2572816 + 17032129 = 1604^2 + 4127^2 .

It is a cyclic number.

It is not a de Polignac number, because 19604945 - 2⁶ = 19604881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19604899 and 19604908.

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, 1960490 + ... + 1960499.

It is an arithmetic number, because the mean of its divisors is an integer number (5881485).

Almost surely, 2^19604945 is an apocalyptic number.

It is an amenable number.

19604945 is a deficient number, since it is larger than the sum of its proper divisors (3920995).

19604945 is an equidigital number, since it uses as much as digits as its factorization.

19604945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3920994.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 19604945 is about 4427.7471698370. The cubic root of 19604945 is about 269.6426227419.

The spelling of 19604945 in words is "nineteen million, six hundred four thousand, nine hundred forty-five".