20236216 has 144 divisors (see below), whose sum is σ = 54726840. Its totient is φ = 6894720.

The previous prime is 20236199. The next prime is 20236253. The reversal of 20236216 is 61263202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1065055 + ... + 1065073.

Almost surely, 2^20236216 is an apocalyptic number.

20236216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20236216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27363420).

20236216 is an abundant number, since it is smaller than the sum of its proper divisors (34490624).

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

20236216 is a wasteful number, since it uses less digits than its factorization.

20236216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20236216 is about 4498.4681837265. The cubic root of 20236216 is about 272.5062299729.

Adding to 20236216 its reverse (61263202), we get a palindrome (81499418).

The spelling of 20236216 in words is "twenty million, two hundred thirty-six thousand, two hundred sixteen".