820134206856 has 24 divisors (see below), whose sum is σ = 2221196810430. Its totient is φ = 273378068928.

The previous prime is 820134206803. The next prime is 820134206887. The reversal of 820134206856 is 658602431028.

It can be written as a sum of positive squares in only one way, i.e., 654594264900 + 165539941956 = 809070^2 + 406866^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5695376365 + ... + 5695376508.

Almost surely, 2^820134206856 is an apocalyptic number.

It is an amenable number.

820134206856 is an abundant number, since it is smaller than the sum of its proper divisors (1401062603574).

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

820134206856 is a wasteful number, since it uses less digits than its factorization.

820134206856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11390752885 (or 11390752878 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 820134206856 in words is "eight hundred twenty billion, one hundred thirty-four million, two hundred six thousand, eight hundred fifty-six".