1320263505 has 24 divisors (see below), whose sum is σ = 2496499200. Its totient is φ = 640127520.

The previous prime is 1320263501. The next prime is 1320263519. The reversal of 1320263505 is 5053620231.

1320263505 is a `hidden beast` number, since 1 + 3 + 20 + 2 + 635 + 0 + 5 = 666.

It is not a de Polignac number, because 1320263505 - 2² = 1320263501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1320263501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1333105 + ... + 1334094.

It is an arithmetic number, because the mean of its divisors is an integer number (104020800).

Almost surely, 2^1320263505 is an apocalyptic number.

1320263505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1320263505 is a deficient number, since it is larger than the sum of its proper divisors (1176235695).

1320263505 is a wasteful number, since it uses less digits than its factorization.

1320263505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667221 (or 2667218 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 1320263505 is about 36335.4304364211. The cubic root of 1320263505 is about 1097.0342992638.

Adding to 1320263505 its reverse (5053620231), we get a palindrome (6373883736).

It can be divided in two parts, 132026 and 3505, that added together give a palindrome (135531).

The spelling of 1320263505 in words is "one billion, three hundred twenty million, two hundred sixty-three thousand, five hundred five".