20016216 has 96 divisors (see below), whose sum is σ = 59904000. Its totient is φ = 5987520.

The previous prime is 20016193. The next prime is 20016221. The reversal of 20016216 is 61261002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100485 + ... + 100683.

It is an arithmetic number, because the mean of its divisors is an integer number (624000).

Almost surely, 2^20016216 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 20016216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29952000).

20016216 is an abundant number, since it is smaller than the sum of its proper divisors (39887784).

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

20016216 is a wasteful number, since it uses less digits than its factorization.

20016216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20016216 is about 4473.9485915687. The cubic root of 20016216 is about 271.5151035013.

Adding to 20016216 its reverse (61261002), we get a palindrome (81277218).

The spelling of 20016216 in words is "twenty million, sixteen thousand, two hundred sixteen".