20051801728 has 64 divisors (see below), whose sum is σ = 45845164800. Its totient is φ = 8557581312.

The previous prime is 20051801717. The next prime is 20051801729. The reversal of 20051801728 is 82710815002.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 20051801693 and 20051801702.

It is not an unprimeable number, because it can be changed into a prime (20051801729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167326 + ... + 260962.

It is an arithmetic number, because the mean of its divisors is an integer number (716330700).

Almost surely, 2^20051801728 is an apocalyptic number.

20051801728 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 20051801728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22922582400).

20051801728 is an abundant number, since it is smaller than the sum of its proper divisors (25793363072).

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

20051801728 is an equidigital number, since it uses as much as digits as its factorization.

20051801728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93897 (or 93885 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The spelling of 20051801728 in words is "twenty billion, fifty-one million, eight hundred one thousand, seven hundred twenty-eight".