20318616 has 48 divisors (see below), whose sum is σ = 56379960. Its totient is φ = 6606720.

The previous prime is 20318593. The next prime is 20318651. The reversal of 20318616 is 61681302.

It is a self number, because there is not a number n which added to its sum of digits gives 20318616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 490 + ... + 6393.

Almost surely, 2^20318616 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 20318616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28189980).

20318616 is an abundant number, since it is smaller than the sum of its proper divisors (36061344).

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

20318616 is a wasteful number, since it uses less digits than its factorization.

20318616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6936 (or 6929 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20318616 is about 4507.6175525437. The cubic root of 20318616 is about 272.8756024640.

Adding to 20318616 its reverse (61681302), we get a palindrome (81999918).

The spelling of 20318616 in words is "twenty million, three hundred eighteen thousand, six hundred sixteen".