19908906 has 16 divisors (see below), whose sum is σ = 41191200. Its totient is φ = 6407408.

The previous prime is 19908899. The next prime is 19908919. The reversal of 19908906 is 60980991.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 57036 + ... + 57383.

It is an arithmetic number, because the mean of its divisors is an integer number (2574450).

Almost surely, 2^19908906 is an apocalyptic number.

19908906 is an abundant number, since it is smaller than the sum of its proper divisors (21282294).

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

19908906 is a wasteful number, since it uses less digits than its factorization.

19908906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114453.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 19908906 is about 4461.9397127258. The cubic root of 19908906 is about 271.0290224588.

The spelling of 19908906 in words is "nineteen million, nine hundred eight thousand, nine hundred six".