20440344321 has 24 divisors (see below), whose sum is σ = 30306317184. Its totient is φ = 13269207840.

The previous prime is 20440344313. The next prime is 20440344377. The reversal of 20440344321 is 12344304402.

It is a happy number.

It is not a de Polignac number, because 20440344321 - 2³ = 20440344313 is a prime.

It is a super-2 number, since 2×20440344321² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20440344391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39315 + ... + 205976.

It is an arithmetic number, because the mean of its divisors is an integer number (1262763216).

Almost surely, 2^20440344321 is an apocalyptic number.

It is an amenable number.

20440344321 is a deficient number, since it is larger than the sum of its proper divisors (9865972863).

20440344321 is a wasteful number, since it uses less digits than its factorization.

20440344321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245541 (or 245538 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 20440344321 its reverse (12344304402), we get a palindrome (32784648723).

The spelling of 20440344321 in words is "twenty billion, four hundred forty million, three hundred forty-four thousand, three hundred twenty-one".