20840823328 has 96 divisors (see below), whose sum is σ = 46908817200. Its totient is φ = 9029222400.

The previous prime is 20840823307. The next prime is 20840823329. The reversal of 20840823328 is 82332804802.

It can be written as a sum of positive squares in 8 ways, for example, as 17777422224 + 3063401104 = 133332^2 + 55348^2 .

It is not an unprimeable number, because it can be changed into a prime (20840823329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2832198 + ... + 2839546.

Almost surely, 2^20840823328 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 20840823328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23454408600).

20840823328 is an abundant number, since it is smaller than the sum of its proper divisors (26067993872).

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

20840823328 is a wasteful number, since it uses less digits than its factorization.

20840823328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7790 (or 7782 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 20840823328 in words is "twenty billion, eight hundred forty million, eight hundred twenty-three thousand, three hundred twenty-eight".