20212236 has 72 divisors (see below), whose sum is σ = 57081024. Its totient is φ = 5977440.

The previous prime is 20212223. The next prime is 20212259. The reversal of 20212236 is 63221202.

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

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, 16435 + ... + 17621.

It is an arithmetic number, because the mean of its divisors is an integer number (792792).

Almost surely, 2^20212236 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 20212236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28540512).

20212236 is an abundant number, since it is smaller than the sum of its proper divisors (36868788).

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

20212236 is a wasteful number, since it uses less digits than its factorization.

20212236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251 (or 1246 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20212236 is about 4495.8020419053. The cubic root of 20212236 is about 272.3985470887.

Adding to 20212236 its reverse (63221202), we get a palindrome (83433438).

The spelling of 20212236 in words is "twenty million, two hundred twelve thousand, two hundred thirty-six".