20899116 has 72 divisors (see below), whose sum is σ = 60802560. Its totient is φ = 5929056.

The previous prime is 20899093. The next prime is 20899121. The reversal of 20899116 is 61199802.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60055 + ... + 60401.

It is an arithmetic number, because the mean of its divisors is an integer number (844480).

Almost surely, 2^20899116 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 20899116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30401280).

20899116 is an abundant number, since it is smaller than the sum of its proper divisors (39903444).

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

20899116 is a wasteful number, since it uses less digits than its factorization.

20899116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 20899116 is about 4571.5550964633. Note that the first 3 decimals coincide. The cubic root of 20899116 is about 275.4499125569.

The spelling of 20899116 in words is "twenty million, eight hundred ninety-nine thousand, one hundred sixteen".