321304020 has 144 divisors (see below), whose sum is σ = 963228672. Its totient is φ = 79988480.

The previous prime is 321304013. The next prime is 321304033. The reversal of 321304020 is 20403123.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1682125 + ... + 1682315.

It is an arithmetic number, because the mean of its divisors is an integer number (6689088).

Almost surely, 2^321304020 is an apocalyptic number.

321304020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321304020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (481614336).

321304020 is an abundant number, since it is smaller than the sum of its proper divisors (641924652).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321304020 is a wasteful number, since it uses less digits than its factorization.

321304020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 321304020 is about 17924.9552300696. The cubic root of 321304020 is about 684.9182206525.

Adding to 321304020 its reverse (20403123), we get a palindrome (341707143).

The spelling of 321304020 in words is "three hundred twenty-one million, three hundred four thousand, twenty".