20569832064 has 160 divisors (see below), whose sum is σ = 61315056000. Its totient is φ = 6845465088.

The previous prime is 20569832011. The next prime is 20569832071. The reversal of 20569832064 is 46023896502.

20569832064 is a `hidden beast` number, since 2 + 0 + 569 + 8 + 3 + 20 + 64 = 666.

It is a super-2 number, since 2×20569832064² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8573137 + ... + 8575535.

It is an arithmetic number, because the mean of its divisors is an integer number (383219100).

Almost surely, 2^20569832064 is an apocalyptic number.

20569832064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20569832064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30657528000).

20569832064 is an abundant number, since it is smaller than the sum of its proper divisors (40745223936).

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

20569832064 is an equidigital number, since it uses as much as digits as its factorization.

20569832064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3252 (or 3231 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 20569832064 in words is "twenty billion, five hundred sixty-nine million, eight hundred thirty-two thousand, sixty-four".