20340554728 has 96 divisors (see below), whose sum is σ = 44071084800. Its totient is φ = 8771203584.

The previous prime is 20340554713. The next prime is 20340554749. The reversal of 20340554728 is 82745504302.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1869801 + ... + 1880647.

It is an arithmetic number, because the mean of its divisors is an integer number (459073800).

Almost surely, 2^20340554728 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 20340554728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22035542400).

20340554728 is an abundant number, since it is smaller than the sum of its proper divisors (23730530072).

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

20340554728 is a wasteful number, since it uses less digits than its factorization.

20340554728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10971 (or 10954 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 40.

The spelling of 20340554728 in words is "twenty billion, three hundred forty million, five hundred fifty-four thousand, seven hundred twenty-eight".