320204520 has 96 divisors (see below), whose sum is σ = 1101901320. Its totient is φ = 80363520.

The previous prime is 320204513. The next prime is 320204539. The reversal of 320204520 is 25402023.

It can be written as a sum of positive squares in 4 ways, for example, as 264582756 + 55621764 = 16266^2 + 7458^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 320204493 and 320204502.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20041 + ... + 32280.

Almost surely, 2^320204520 is an apocalyptic number.

320204520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320204520 is an abundant number, since it is smaller than the sum of its proper divisors (781696800).

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

320204520 is a wasteful number, since it uses less digits than its factorization.

320204520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52355 (or 52348 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 320204520 is about 17894.2594146838. The cubic root of 320204520 is about 684.1360660879.

Adding to 320204520 its reverse (25402023), we get a palindrome (345606543).

The spelling of 320204520 in words is "three hundred twenty million, two hundred four thousand, five hundred twenty".