20440344320 has 72 divisors (see below), whose sum is σ = 53412050160. Its totient is φ = 7432847360.

The previous prime is 20440344313. The next prime is 20440344377. The reversal of 20440344320 is 2344304402.

It is a self number, because there is not a number n which added to its sum of digits gives 20440344320.

It is a congruent number.

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, 711785 + ... + 739944.

It is an arithmetic number, because the mean of its divisors is an integer number (741834030).

Almost surely, 2^20440344320 is an apocalyptic number.

20440344320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20440344320 is an abundant number, since it is smaller than the sum of its proper divisors (32971705840).

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

20440344320 is a wasteful number, since it uses less digits than its factorization.

20440344320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451761 (or 1451747 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 26.

Adding to 20440344320 its reverse (2344304402), we get a palindrome (22784648722).

The spelling of 20440344320 in words is "twenty billion, four hundred forty million, three hundred forty-four thousand, three hundred twenty".