20586216 has 64 divisors (see below), whose sum is σ = 59230080. Its totient is φ = 5840640.

The previous prime is 20586211. The next prime is 20586217. The reversal of 20586216 is 61268502.

It is not an unprimeable number, because it can be changed into a prime (20586211) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 30070 + ... + 30746.

It is an arithmetic number, because the mean of its divisors is an integer number (925470).

Almost surely, 2^20586216 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 20586216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29615040).

20586216 is an abundant number, since it is smaller than the sum of its proper divisors (38643864).

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

20586216 is a wasteful number, since it uses less digits than its factorization.

20586216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20586216 is about 4537.2035440346. The cubic root of 20586216 is about 274.0683226002.

It can be divided in two parts, 20586 and 216, that added together give a palindrome (20802).

The spelling of 20586216 in words is "twenty million, five hundred eighty-six thousand, two hundred sixteen".