20663316 has 48 divisors (see below), whose sum is σ = 55030080. Its totient is φ = 6700320.

The previous prime is 20663309. The next prime is 20663327. The reversal of 20663316 is 61336602.

20663316 is a `hidden beast` number, since 20 + 6 + 633 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20663316.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1411 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (1146460).

Almost surely, 2^20663316 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 20663316, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27515040).

20663316 is an abundant number, since it is smaller than the sum of its proper divisors (34366764).

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

20663316 is a wasteful number, since it uses less digits than its factorization.

20663316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5221 (or 5213 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 20663316 is about 4545.6920265236. The cubic root of 20663316 is about 274.4100454748.

Adding to 20663316 its reverse (61336602), we get a palindrome (81999918).

The spelling of 20663316 in words is "twenty million, six hundred sixty-three thousand, three hundred sixteen".