851020 has 24 divisors (see below), whose sum is σ = 1893024. Its totient is φ = 320256.

The previous prime is 851017. The next prime is 851033. The reversal of 851020 is 20158.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 850985 and 851003.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 912 + ... + 1591.

It is an arithmetic number, because the mean of its divisors is an integer number (78876).

2⁸⁵¹⁰²⁰ is an apocalyptic number.

It is an amenable number.

851020 is an abundant number, since it is smaller than the sum of its proper divisors (1042004).

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

851020 is a wasteful number, since it uses less digits than its factorization.

851020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2529 (or 2527 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 851020 is about 922.5074525444. The cubic root of 851020 is about 94.7646993019.

Adding to 851020 its reverse (20158), we get a palindrome (871178).

The spelling of 851020 in words is "eight hundred fifty-one thousand, twenty".