20065885728 has 144 divisors (see below), whose sum is σ = 61375073760. Its totient is φ = 5723526144.

The previous prime is 20065885717. The next prime is 20065885729. The reversal of 20065885728 is 82758856002.

It is not an unprimeable number, because it can be changed into a prime (20065885729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3096700 + ... + 3103172.

It is an arithmetic number, because the mean of its divisors is an integer number (426215790).

Almost surely, 2^20065885728 is an apocalyptic number.

20065885728 is a gapful number since it is divisible by the number (28) 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 20065885728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30687536880).

20065885728 is an abundant number, since it is smaller than the sum of its proper divisors (41309188032).

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

20065885728 is a wasteful number, since it uses less digits than its factorization.

20065885728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7159 (or 7144 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 51.

The spelling of 20065885728 in words is "twenty billion, sixty-five million, eight hundred eighty-five thousand, seven hundred twenty-eight".