320421045 has 24 divisors (see below), whose sum is σ = 596376864. Its totient is φ = 146477856.

The previous prime is 320421041. The next prime is 320421089. The reversal of 320421045 is 540124023.

It is not a de Polignac number, because 320421045 - 2² = 320421041 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320421041) 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, 217239 + ... + 218708.

It is an arithmetic number, because the mean of its divisors is an integer number (24849036).

Almost surely, 2^320421045 is an apocalyptic number.

320421045 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

320421045 is a deficient number, since it is larger than the sum of its proper divisors (275955819).

320421045 is a wasteful number, since it uses less digits than its factorization.

320421045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435969 (or 435962 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 320421045 is about 17900.3085168943. The cubic root of 320421045 is about 684.2902375371.

Adding to 320421045 its reverse (540124023), we get a palindrome (860545068).

The spelling of 320421045 in words is "three hundred twenty million, four hundred twenty-one thousand, forty-five".