20841513728 has 72 divisors (see below), whose sum is σ = 47715054240. Its totient is φ = 8900075520.

The previous prime is 20841513713. The next prime is 20841513767. The reversal of 20841513728 is 82731514802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482858 + ... + 524246.

Almost surely, 2^20841513728 is an apocalyptic number.

20841513728 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 20841513728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23857527120).

20841513728 is an abundant number, since it is smaller than the sum of its proper divisors (26873540512).

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

20841513728 is an equidigital number, since it uses as much as digits as its factorization.

20841513728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41693 (or 41679 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 20841513728 in words is "twenty billion, eight hundred forty-one million, five hundred thirteen thousand, seven hundred twenty-eight".