19906904 has 8 divisors (see below), whose sum is σ = 37325460. Its totient is φ = 9953448.

The previous prime is 19906903. The next prime is 19906907. The reversal of 19906904 is 40960991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19906903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1244174 + ... + 1244189.

Almost surely, 2^19906904 is an apocalyptic number.

It is an amenable number.

19906904 is a deficient number, since it is larger than the sum of its proper divisors (17418556).

19906904 is a wasteful number, since it uses less digits than its factorization.

19906904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488369 (or 2488365 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 19906904 is about 4461.7153651931. The cubic root of 19906904 is about 271.0199374410.

The spelling of 19906904 in words is "nineteen million, nine hundred six thousand, nine hundred four".