320203234505 has 32 divisors (see below), whose sum is σ = 495576541440. Its totient is φ = 192724197120.

The previous prime is 320203234493. The next prime is 320203234513. The reversal of 320203234505 is 505432302023.

It is not a de Polignac number, because 320203234505 - 2⁴ = 320203234489 is a prime.

It is a super-2 number, since 2×320203234505² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14328434 + ... + 14350763.

It is an arithmetic number, because the mean of its divisors is an integer number (15486766920).

Almost surely, 2^320203234505 is an apocalyptic number.

320203234505 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

320203234505 is a deficient number, since it is larger than the sum of its proper divisors (175373306935).

320203234505 is a wasteful number, since it uses less digits than its factorization.

320203234505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28679249.

The product of its (nonzero) digits is 21600, while the sum is 29.

Adding to 320203234505 its reverse (505432302023), we get a palindrome (825635536528).

The spelling of 320203234505 in words is "three hundred twenty billion, two hundred three million, two hundred thirty-four thousand, five hundred five".