804644020 has 24 divisors (see below), whose sum is σ = 1698515784. Its totient is φ = 320188416.

The previous prime is 804643999. The next prime is 804644021. The reversal of 804644020 is 20446408.

It can be written as a sum of positive squares in 4 ways, for example, as 467856 + 804176164 = 684^2 + 28358^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 804644020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (804644021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100369 + ... + 108088.

It is an arithmetic number, because the mean of its divisors is an integer number (70771491).

Almost surely, 2^804644020 is an apocalyptic number.

It is an amenable number.

804644020 is an abundant number, since it is smaller than the sum of its proper divisors (893871764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

804644020 is a wasteful number, since it uses less digits than its factorization.

804644020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208659 (or 208657 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 804644020 is about 28366.2479013351. The cubic root of 804644020 is about 930.1106046431.

The spelling of 804644020 in words is "eight hundred four million, six hundred forty-four thousand, twenty".