820799317394 has 32 divisors (see below), whose sum is σ = 1412087475456. Its totient is φ = 350520747840.

The previous prime is 820799317367. The next prime is 820799317397. The reversal of 820799317394 is 493713997028.

It is not an unprimeable number, because it can be changed into a prime (820799317397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52583939 + ... + 52599545.

It is an arithmetic number, because the mean of its divisors is an integer number (44127733608).

Almost surely, 2^820799317394 is an apocalyptic number.

820799317394 is a deficient number, since it is larger than the sum of its proper divisors (591288158062).

820799317394 is a wasteful number, since it uses less digits than its factorization.

820799317394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28730.

The product of its (nonzero) digits is 20575296, while the sum is 62.

The spelling of 820799317394 in words is "eight hundred twenty billion, seven hundred ninety-nine million, three hundred seventeen thousand, three hundred ninety-four".