19909936 has 40 divisors (see below), whose sum is σ = 40247424. Its totient is φ = 9530880.

The previous prime is 19909931. The next prime is 19909937. The reversal of 19909936 is 63990991.

It is not an unprimeable number, because it can be changed into a prime (19909931) 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 7 ways as a sum of consecutive naturals, for example, 67806 + ... + 68098.

Almost surely, 2^19909936 is an apocalyptic number.

19909936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19909936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20123712).

19909936 is an abundant number, since it is smaller than the sum of its proper divisors (20337488).

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

19909936 is a wasteful number, since it uses less digits than its factorization.

19909936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 19909936 is about 4462.0551318871. The cubic root of 19909936 is about 271.0336963315.

The spelling of 19909936 in words is "nineteen million, nine hundred nine thousand, nine hundred thirty-six".