20985108 has 48 divisors (see below), whose sum is σ = 51555840. Its totient is φ = 6630624.

The previous prime is 20985059. The next prime is 20985113. The reversal of 20985108 is 80158902.

It is a happy number.

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, 38091 + ... + 38637.

It is an arithmetic number, because the mean of its divisors is an integer number (1074080).

Almost surely, 2^20985108 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 20985108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25777920).

20985108 is an abundant number, since it is smaller than the sum of its proper divisors (30570732).

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

20985108 is a wasteful number, since it uses less digits than its factorization.

20985108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 33.

The square root of 20985108 is about 4580.9505563802. The cubic root of 20985108 is about 275.8271865038.

The spelling of 20985108 in words is "twenty million, nine hundred eighty-five thousand, one hundred eight".