320404020 has 24 divisors (see below), whose sum is σ = 897131424. Its totient is φ = 85441056.

The previous prime is 320404001. The next prime is 320404033. The reversal of 320404020 is 20404023.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 2669974 + ... + 2670093.

It is an arithmetic number, because the mean of its divisors is an integer number (37380476).

Almost surely, 2^320404020 is an apocalyptic number.

320404020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320404020 is an abundant number, since it is smaller than the sum of its proper divisors (576727404).

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

320404020 is a wasteful number, since it uses less digits than its factorization.

320404020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5340079 (or 5340077 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 320404020 is about 17899.8329601145. The cubic root of 320404020 is about 684.2781178092.

Adding to 320404020 its reverse (20404023), we get a palindrome (340808043).

The spelling of 320404020 in words is "three hundred twenty million, four hundred four thousand, twenty".