20420303321 has 24 divisors (see below), whose sum is σ = 23898844800. Its totient is φ = 17298656000.

The previous prime is 20420303269. The next prime is 20420303369. The reversal of 20420303321 is 12330302402.

It is not a de Polignac number, because 20420303321 - 2²² = 20416109017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20420303293 and 20420303302.

It is not an unprimeable number, because it can be changed into a prime (20420303621) 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, 289280 + ... + 352878.

It is an arithmetic number, because the mean of its divisors is an integer number (995785200).

Almost surely, 2^20420303321 is an apocalyptic number.

It is an amenable number.

20420303321 is a deficient number, since it is larger than the sum of its proper divisors (3478541479).

20420303321 is a wasteful number, since it uses less digits than its factorization.

20420303321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63745 (or 63728 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 20420303321 its reverse (12330302402), we get a palindrome (32750605723).

The spelling of 20420303321 in words is "twenty billion, four hundred twenty million, three hundred three thousand, three hundred twenty-one".