20506016 has 48 divisors (see below), whose sum is σ = 43999200. Its totient is φ = 9370368.

The previous prime is 20506009. The next prime is 20506019. The reversal of 20506016 is 61060502.

It is not an unprimeable number, because it can be changed into a prime (20506019) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 17051 + ... + 18213.

It is an arithmetic number, because the mean of its divisors is an integer number (916650).

Almost surely, 2^20506016 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 20506016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21999600).

20506016 is an abundant number, since it is smaller than the sum of its proper divisors (23493184).

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

20506016 is a wasteful number, since it uses less digits than its factorization.

20506016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221 (or 1213 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 20506016 is about 4528.3568763957. The cubic root of 20506016 is about 273.7119533176.

Adding to 20506016 its reverse (61060502), we get a palindrome (81566518).

The spelling of 20506016 in words is "twenty million, five hundred six thousand, sixteen".