19668906 has 24 divisors (see below), whose sum is σ = 44195424. Its totient is φ = 6556140.

The previous prime is 19668853. The next prime is 19668907. The reversal of 19668906 is 60986691.

It is not an unprimeable number, because it can be changed into a prime (19668907) 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 in 11 ways as a sum of consecutive naturals, for example, 19750 + ... + 20721.

It is an arithmetic number, because the mean of its divisors is an integer number (1841476).

Almost surely, 2^19668906 is an apocalyptic number.

19668906 is an abundant number, since it is smaller than the sum of its proper divisors (24526518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19668906 is an equidigital number, since it uses as much as digits as its factorization.

19668906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40488 (or 40476 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 19668906 is about 4434.9640359308. The cubic root of 19668906 is about 269.9355401676.

The spelling of 19668906 in words is "nineteen million, six hundred sixty-eight thousand, nine hundred six".