820391318 has 16 divisors (see below), whose sum is σ = 1259182800. Its totient is φ = 400754400.

The previous prime is 820391317. The next prime is 820391357. The reversal of 820391318 is 813193028.

820391318 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820391311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4388 + ... + 40743.

It is an arithmetic number, because the mean of its divisors is an integer number (78698925).

Almost surely, 2^820391318 is an apocalyptic number.

820391318 is a deficient number, since it is larger than the sum of its proper divisors (438791482).

820391318 is a wasteful number, since it uses less digits than its factorization.

820391318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45343.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 820391318 is about 28642.4740202378. The cubic root of 820391318 is about 936.1390287980.

The spelling of 820391318 in words is "eight hundred twenty million, three hundred ninety-one thousand, three hundred eighteen".