320403630505 has 32 divisors (see below), whose sum is σ = 441921945600. Its totient is φ = 218451245760.

The previous prime is 320403630493. The next prime is 320403630557. The reversal of 320403630505 is 505036304023.

It is a happy number.

It is not a de Polignac number, because 320403630505 - 2²³ = 320395241897 is a prime.

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, 10648392 + ... + 10678438.

It is an arithmetic number, because the mean of its divisors is an integer number (13810060800).

Almost surely, 2^320403630505 is an apocalyptic number.

320403630505 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

320403630505 is a deficient number, since it is larger than the sum of its proper divisors (121518315095).

320403630505 is a wasteful number, since it uses less digits than its factorization.

320403630505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31789.

The product of its (nonzero) digits is 32400, while the sum is 31.

Adding to 320403630505 its reverse (505036304023), we get a palindrome (825439934528).

The spelling of 320403630505 in words is "three hundred twenty billion, four hundred three million, six hundred thirty thousand, five hundred five".