20636616 has 128 divisors (see below), whose sum is σ = 69350400. Its totient is φ = 4942080.

The previous prime is 20636599. The next prime is 20636621. The reversal of 20636616 is 61663602.

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 31 ways as a sum of consecutive naturals, for example, 23595 + ... + 24453.

It is an arithmetic number, because the mean of its divisors is an integer number (541800).

Almost surely, 2^20636616 is an apocalyptic number.

20636616 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 20636616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34675200).

20636616 is an abundant number, since it is smaller than the sum of its proper divisors (48713784).

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

20636616 is a wasteful number, since it uses less digits than its factorization.

20636616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899 (or 895 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 20636616 is about 4542.7542306403. The cubic root of 20636616 is about 274.2918020102.

It can be divided in two parts, 20 and 636616, that added together give a palindrome (636636).

The spelling of 20636616 in words is "twenty million, six hundred thirty-six thousand, six hundred sixteen".