820041808 has 10 divisors (see below), whose sum is σ = 1588831034. Its totient is φ = 410020896.

The previous prime is 820041799. The next prime is 820041809. The reversal of 820041808 is 808140028.

It can be written as a sum of positive squares in only one way, i.e., 814988304 + 5053504 = 28548^2 + 2248^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 820041808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820041809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25626291 + ... + 25626322.

Almost surely, 2^820041808 is an apocalyptic number.

It is an amenable number.

820041808 is a deficient number, since it is larger than the sum of its proper divisors (768789226).

820041808 is a wasteful number, since it uses less digits than its factorization.

820041808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51252621 (or 51252615 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 820041808 is about 28636.3721165933. The cubic root of 820041808 is about 936.0060693107.

The spelling of 820041808 in words is "eight hundred twenty million, forty-one thousand, eight hundred eight".