20328321585636 has 135 divisors (see below), whose sum is σ = 53355898314873. Its totient is φ = 6748973874720.

The previous prime is 20328321585617. The next prime is 20328321585647. The reversal of 20328321585636 is 63658512382302.

The square root of 20328321585636 is 4508694.

It is a perfect power (a square), and thus also a powerful number.

20328321585636 is a `hidden beast` number, since 2 + 0 + 3 + 2 + 8 + 3 + 21 + 58 + 563 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8076361507236 + 12251960078400 = 2841894^2 + 3500280^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 37575455526 + ... + 37575456066.

Almost surely, 2^{20328321585636} is an apocalyptic number.

20328321585636 is the 4508694-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20328321585636

20328321585636 is an abundant number, since it is smaller than the sum of its proper divisors (33027576729237).

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

20328321585636 is an frugal number, since it uses more digits than its factorization.

20328321585636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2024 (or 1009 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 54.

The spelling of 20328321585636 in words is "twenty trillion, three hundred twenty-eight billion, three hundred twenty-one million, five hundred eighty-five thousand, six hundred thirty-six".