20042320321 has 8 divisors (see below), whose sum is σ = 21086055144. Its totient is φ = 19025009280.

The previous prime is 20042320279. The next prime is 20042320327. The reversal of 20042320321 is 12302324002.

It can be written as a sum of positive squares in 4 ways, for example, as 359633296 + 19682687025 = 18964^2 + 140295^2 .

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

It is not a de Polignac number, because 20042320321 - 2⁹ = 20042319809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20042320327) 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, 6604390 + ... + 6607423.

It is an arithmetic number, because the mean of its divisors is an integer number (2635756893).

Almost surely, 2^20042320321 is an apocalyptic number.

It is an amenable number.

20042320321 is a deficient number, since it is larger than the sum of its proper divisors (1043734823).

20042320321 is a wasteful number, since it uses less digits than its factorization.

20042320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13211891.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20042320321 its reverse (12302324002), we get a palindrome (32344644323).

The spelling of 20042320321 in words is "twenty billion, forty-two million, three hundred twenty thousand, three hundred twenty-one".