320545505 has 20 divisors (see below), whose sum is σ = 448753812. Its totient is φ = 219794400.

The previous prime is 320545483. The next prime is 320545543. The reversal of 320545505 is 505545023.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 62236321 + 258309184 = 7889^2 + 16072^2 .

It is not a de Polignac number, because 320545505 - 2⁶ = 320545441 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1346 + ... + 25355.

Almost surely, 2^320545505 is an apocalyptic number.

320545505 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

320545505 is a deficient number, since it is larger than the sum of its proper divisors (128208307).

320545505 is an frugal number, since it uses more digits than its factorization.

320545505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26734 (or 26713 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 29.

The square root of 320545505 is about 17903.7846557648. The cubic root of 320545505 is about 684.3788248711.

The spelling of 320545505 in words is "three hundred twenty million, five hundred forty-five thousand, five hundred five".