20868271728 has 160 divisors (see below), whose sum is σ = 57202963776. Its totient is φ = 6547267584.

The previous prime is 20868271693. The next prime is 20868271751. The reversal of 20868271728 is 82717286802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6869826 + ... + 6872862.

Almost surely, 2^20868271728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20868271728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28601481888).

20868271728 is an abundant number, since it is smaller than the sum of its proper divisors (36334692048).

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

20868271728 is a wasteful number, since it uses less digits than its factorization.

20868271728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211 (or 3205 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 51.

The spelling of 20868271728 in words is "twenty billion, eight hundred sixty-eight million, two hundred seventy-one thousand, seven hundred twenty-eight".