20528399680672 has 96 divisors (see below), whose sum is σ = 44930657608704. Its totient is φ = 9168502579200.

The previous prime is 20528399680639. The next prime is 20528399680709. The reversal of 20528399680672 is 27608699382502.

It is a junction number, because it is equal to n+sod(n) for n = 20528399680598 and 20528399680607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323928733 + ... + 323992099.

It is an arithmetic number, because the mean of its divisors is an integer number (468027683424).

Almost surely, 2^{20528399680672} 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 20528399680672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22465328804352).

20528399680672 is an abundant number, since it is smaller than the sum of its proper divisors (24402257928032).

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

20528399680672 is a wasteful number, since it uses less digits than its factorization.

20528399680672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88542 (or 88534 counting only the distinct ones).

The product of its (nonzero) digits is 156764160, while the sum is 67.

The spelling of 20528399680672 in words is "twenty trillion, five hundred twenty-eight billion, three hundred ninety-nine million, six hundred eighty thousand, six hundred seventy-two".