20328781760 has 112 divisors (see below), whose sum is σ = 56367493056. Its totient is φ = 6838321152.

The previous prime is 20328781673. The next prime is 20328781769. The reversal of 20328781760 is 6718782302.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20328781769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33104 + ... + 204336.

It is an arithmetic number, because the mean of its divisors is an integer number (503281188).

Almost surely, 2^20328781760 is an apocalyptic number.

20328781760 is a gapful number since it is divisible by the number (20) 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 20328781760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28183746528).

20328781760 is an abundant number, since it is smaller than the sum of its proper divisors (36038711296).

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

20328781760 is a wasteful number, since it uses less digits than its factorization.

20328781760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171310 (or 171300 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 20328781760 in words is "twenty billion, three hundred twenty-eight million, seven hundred eighty-one thousand, seven hundred sixty".