19909136 has 20 divisors (see below), whose sum is σ = 41541612. Its totient is φ = 9188736.

The previous prime is 19909121. The next prime is 19909139. The reversal of 19909136 is 63190991.

It can be written as a sum of positive squares in 2 ways, for example, as 1795600 + 18113536 = 1340^2 + 4256^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19909136.

It is not an unprimeable number, because it can be changed into a prime (19909139) 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 in 3 ways as a sum of consecutive naturals, for example, 47651 + ... + 48066.

Almost surely, 2^19909136 is an apocalyptic number.

19909136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19909136 is an abundant number, since it is smaller than the sum of its proper divisors (21632476).

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

19909136 is a wasteful number, since it uses less digits than its factorization.

19909136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95738 (or 95732 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 19909136 is about 4461.9654861955. The cubic root of 19909136 is about 271.0300661531.

The spelling of 19909136 in words is "nineteen million, nine hundred nine thousand, one hundred thirty-six".