20671327728 has 60 divisors (see below), whose sum is σ = 57898574760. Its totient is φ = 6884777088.

The previous prime is 20671327697. The next prime is 20671327741. The reversal of 20671327728 is 82772317602.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 118575 + ... + 235377.

It is an arithmetic number, because the mean of its divisors is an integer number (964976246).

Almost surely, 2^20671327728 is an apocalyptic number.

It is an amenable number.

20671327728 is an abundant number, since it is smaller than the sum of its proper divisors (37227247032).

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

20671327728 is a wasteful number, since it uses less digits than its factorization.

20671327728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118046 (or 118037 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The spelling of 20671327728 in words is "twenty billion, six hundred seventy-one million, three hundred twenty-seven thousand, seven hundred twenty-eight".