856020 has 48 divisors (see below), whose sum is σ = 2616768. Its totient is φ = 207360.

The previous prime is 855997. The next prime is 856021. The reversal of 856020 is 20658.

856020 = T₃₈₉ + T₃₉₀ + ... + T₃₉₉.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 856020.

It is not an unprimeable number, because it can be changed into a prime (856021) by changing a digit.

856020 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 15 ways as a sum of consecutive naturals, for example, 12 + ... + 1308.

It is an arithmetic number, because the mean of its divisors is an integer number (54516).

2⁸⁵⁶⁰²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1308384).

856020 is an abundant number, since it is smaller than the sum of its proper divisors (1760748).

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

856020 is a wasteful number, since it uses less digits than its factorization.

856020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320 (or 1318 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 856020 is about 925.2134888770. The cubic root of 856020 is about 94.9499274444.

Adding to 856020 its reverse (20658), we get a palindrome (876678).

It can be divided in two parts, 85 and 6020, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 856020 in words is "eight hundred fifty-six thousand, twenty".