20109936 has 80 divisors (see below), whose sum is σ = 64781568. Its totient is φ = 5222400.

The previous prime is 20109911. The next prime is 20109953. The reversal of 20109936 is 63990102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 976 + ... + 6416.

Almost surely, 2^20109936 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 20109936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32390784).

20109936 is an abundant number, since it is smaller than the sum of its proper divisors (44671632).

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

20109936 is a wasteful number, since it uses less digits than its factorization.

20109936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5470 (or 5464 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 20109936 is about 4484.4103291291. The cubic root of 20109936 is about 271.9382068394.

The spelling of 20109936 in words is "twenty million, one hundred nine thousand, nine hundred thirty-six".