19420904 has 8 divisors (see below), whose sum is σ = 36414210. Its totient is φ = 9710448.

The previous prime is 19420903. The next prime is 19420913. The reversal of 19420904 is 40902491.

It can be written as a sum of positive squares in only one way, i.e., 10432900 + 8988004 = 3230^2 + 2998^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (19420903) by changing a digit.

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, 1213799 + ... + 1213814.

Almost surely, 2^19420904 is an apocalyptic number.

It is an amenable number.

19420904 is a deficient number, since it is larger than the sum of its proper divisors (16993306).

19420904 is a wasteful number, since it uses less digits than its factorization.

19420904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427619 (or 2427615 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 19420904 is about 4406.9154745695. The cubic root of 19420904 is about 268.7962138663.

The spelling of 19420904 in words is "nineteen million, four hundred twenty thousand, nine hundred four".