820926686 has 16 divisors (see below), whose sum is σ = 1283463168. Its totient is φ = 393363000.

The previous prime is 820926677. The next prime is 820926703. The reversal of 820926686 is 686629028.

It is a self number, because there is not a number n which added to its sum of digits gives 820926686.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 57890 + ... + 70661.

It is an arithmetic number, because the mean of its divisors is an integer number (80216448).

Almost surely, 2^820926686 is an apocalyptic number.

820926686 is a deficient number, since it is larger than the sum of its proper divisors (462536482).

820926686 is a wasteful number, since it uses less digits than its factorization.

820926686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128687.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 820926686 is about 28651.8181971057. The cubic root of 820926686 is about 936.3426185927.

The spelling of 820926686 in words is "eight hundred twenty million, nine hundred twenty-six thousand, six hundred eighty-six".