320420421 has 16 divisors (see below), whose sum is σ = 480419520. Its totient is φ = 211038480.

The previous prime is 320420417. The next prime is 320420431. The reversal of 320420421 is 124024023.

It is not a de Polignac number, because 320420421 - 2² = 320420417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320420394 and 320420403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320420431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69250 + ... + 73731.

It is an arithmetic number, because the mean of its divisors is an integer number (30026220).

Almost surely, 2^320420421 is an apocalyptic number.

It is an amenable number.

320420421 is a deficient number, since it is larger than the sum of its proper divisors (159999099).

320420421 is a wasteful number, since it uses less digits than its factorization.

320420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143073 (or 143067 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 320420421 is about 17900.2910870187. The cubic root of 320420421 is about 684.2897933327.

Adding to 320420421 its reverse (124024023), we get a palindrome (444444444).

The spelling of 320420421 in words is "three hundred twenty million, four hundred twenty thousand, four hundred twenty-one".