820104556 has 24 divisors (see below), whose sum is σ = 1483773536. Its totient is φ = 396316800.

The previous prime is 820104539. The next prime is 820104559. The reversal of 820104556 is 655401028.

820104556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (820104559) 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, 4000 + ... + 40696.

Almost surely, 2^820104556 is an apocalyptic number.

It is an amenable number.

820104556 is a deficient number, since it is larger than the sum of its proper divisors (663668980).

820104556 is a wasteful number, since it uses less digits than its factorization.

820104556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36889 (or 36887 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 820104556 is about 28637.4676953113. The cubic root of 820104556 is about 936.0299424882.

The spelling of 820104556 in words is "eight hundred twenty million, one hundred four thousand, five hundred fifty-six".