857020 has 24 divisors (see below), whose sum is σ = 1827504. Its totient is φ = 337536.

The previous prime is 857011. The next prime is 857027. The reversal of 857020 is 20758.

857020 = T₄₀₉ + T₄₁₀ + ... + T₄₁₈.

It is a junction number, because it is equal to n+sod(n) for n = 856982 and 857000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857027) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1167 + ... + 1753.

It is an arithmetic number, because the mean of its divisors is an integer number (76146).

2⁸⁵⁷⁰²⁰ is an apocalyptic number.

It is an amenable number.

857020 is an abundant number, since it is smaller than the sum of its proper divisors (970484).

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

857020 is a wasteful number, since it uses less digits than its factorization.

857020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 857020 is about 925.7537469543. The cubic root of 857020 is about 94.9868864632.

Adding to 857020 its reverse (20758), we get a palindrome (877778).

The spelling of 857020 in words is "eight hundred fifty-seven thousand, twenty".