856704020 has 24 divisors (see below), whose sum is σ = 1842960168. Its totient is φ = 334323200.

The previous prime is 856704011. The next prime is 856704029. The reversal of 856704020 is 20407658.

It is an interprime number because it is at equal distance from previous prime (856704011) and next prime (856704029).

It can be written as a sum of positive squares in 4 ways, for example, as 102981904 + 753722116 = 10148^2 + 27454^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856704029) 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, 521561 + ... + 523200.

It is an arithmetic number, because the mean of its divisors is an integer number (76790007).

Almost surely, 2^856704020 is an apocalyptic number.

It is an amenable number.

856704020 is an abundant number, since it is smaller than the sum of its proper divisors (986256148).

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

856704020 is a wasteful number, since it uses less digits than its factorization.

856704020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044811 (or 1044809 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 856704020 is about 29269.5066579538. The cubic root of 856704020 is about 949.7521126087.

The spelling of 856704020 in words is "eight hundred fifty-six million, seven hundred four thousand, twenty".