19890936 has 96 divisors (see below), whose sum is σ = 58968000. Its totient is φ = 6020352.

The previous prime is 19890919. The next prime is 19890961. The reversal of 19890936 is 63909891.

It is a junction number, because it is equal to n+sod(n) for n = 19890891 and 19890900.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 73810 + ... + 74078.

It is an arithmetic number, because the mean of its divisors is an integer number (614250).

Almost surely, 2^19890936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19890936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29484000).

19890936 is an abundant number, since it is smaller than the sum of its proper divisors (39077064).

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

19890936 is a wasteful number, since it uses less digits than its factorization.

19890936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 19890936 is about 4459.9255599169. The cubic root of 19890936 is about 270.9474533087.

The spelling of 19890936 in words is "nineteen million, eight hundred ninety thousand, nine hundred thirty-six".