20651328 has 224 divisors, whose sum is σ = 69494400. Its totient is φ = 5971968.

The previous prime is 20651327. The next prime is 20651329. The reversal of 20651328 is 82315602.

20651328 is a `hidden beast` number, since 2 + 0 + 651 + 3 + 2 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (20651327) and next prime (20651329).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20651327) 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 31 ways as a sum of consecutive naturals, for example, 558126 + ... + 558162.

Almost surely, 2^20651328 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 20651328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34747200).

20651328 is an abundant number, since it is smaller than the sum of its proper divisors (48843072).

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

20651328 is a wasteful number, since it uses less digits than its factorization.

20651328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 20651328 is about 4544.3732241091. The cubic root of 20651328 is about 274.3569680953.

The spelling of 20651328 in words is "twenty million, six hundred fifty-one thousand, three hundred twenty-eight".