20440402321 has 8 divisors (see below), whose sum is σ = 20667069864. Its totient is φ = 20214211200.

The previous prime is 20440402313. The next prime is 20440402337. The reversal of 20440402321 is 12320404402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3394227600 + 17046174721 = 58260^2 + 130561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20440402321 - 2³ = 20440402313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20440402292 and 20440402301.

It is not an unprimeable number, because it can be changed into a prime (20440402391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32476 + ... + 204781.

It is an arithmetic number, because the mean of its divisors is an integer number (2583383733).

Almost surely, 2^20440402321 is an apocalyptic number.

It is an amenable number.

20440402321 is a deficient number, since it is larger than the sum of its proper divisors (226667543).

20440402321 is a wasteful number, since it uses less digits than its factorization.

20440402321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238211.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 20440402321 its reverse (12320404402), we get a palindrome (32760806723).

The spelling of 20440402321 in words is "twenty billion, four hundred forty million, four hundred two thousand, three hundred twenty-one".