20180216 has 32 divisors (see below), whose sum is σ = 43740000. Its totient is φ = 8549376.

The previous prime is 20180213. The next prime is 20180221. The reversal of 20180216 is 61208102.

It is a super-2 number, since 2×20180216² = 814482235613312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20180213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2960 + ... + 7008.

It is an arithmetic number, because the mean of its divisors is an integer number (1366875).

Almost surely, 2^20180216 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 20180216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21870000).

20180216 is an abundant number, since it is smaller than the sum of its proper divisors (23559784).

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

20180216 is a wasteful number, since it uses less digits than its factorization.

20180216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4151 (or 4147 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 20180216 is about 4492.2395305682. The cubic root of 20180216 is about 272.2546274780.

Adding to 20180216 its reverse (61208102), we get a palindrome (81388318).

The spelling of 20180216 in words is "twenty million, one hundred eighty thousand, two hundred sixteen".