20651364 has 72 divisors (see below), whose sum is σ = 54774720. Its totient is φ = 6552000.

The previous prime is 20651353. The next prime is 20651381. The reversal of 20651364 is 46315602.

20651364 is a `hidden beast` number, since 2 + 0 + 651 + 3 + 6 + 4 = 666.

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 23 ways as a sum of consecutive naturals, for example, 136689 + ... + 136839.

It is an arithmetic number, because the mean of its divisors is an integer number (760760).

Almost surely, 2^20651364 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 20651364, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27387360).

20651364 is an abundant number, since it is smaller than the sum of its proper divisors (34123356).

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

20651364 is a wasteful number, since it uses less digits than its factorization.

20651364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20651364 is about 4544.3771850497. The cubic root of 20651364 is about 274.3571275175.

Adding to 20651364 its reverse (46315602), we get a palindrome (66966966).

The spelling of 20651364 in words is "twenty million, six hundred fifty-one thousand, three hundred sixty-four".