1320208685 has 4 divisors (see below), whose sum is σ = 1584250428. Its totient is φ = 1056166944.

The previous prime is 1320208679. The next prime is 1320208697. The reversal of 1320208685 is 5868020231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 244171876 + 1076036809 = 15626^2 + 32803^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320208685 - 2²⁶ = 1253099821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132020864 + ... + 132020873.

It is an arithmetic number, because the mean of its divisors is an integer number (396062607).

Almost surely, 2^1320208685 is an apocalyptic number.

It is an amenable number.

1320208685 is a deficient number, since it is larger than the sum of its proper divisors (264041743).

1320208685 is an equidigital number, since it uses as much as digits as its factorization.

1320208685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264041742.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 1320208685 is about 36334.6760684611. The cubic root of 1320208685 is about 1097.0191153624.

The spelling of 1320208685 in words is "one billion, three hundred twenty million, two hundred eight thousand, six hundred eighty-five".