845020 has 48 divisors (see below), whose sum is σ = 2032128. Its totient is φ = 292160.

The previous prime is 845017. The next prime is 845021. The reversal of 845020 is 20548.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845021) 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 15 ways as a sum of consecutive naturals, for example, 4977 + ... + 5143.

It is an arithmetic number, because the mean of its divisors is an integer number (42336).

2⁸⁴⁵⁰²⁰ is an apocalyptic number.

845020 is the 460-th decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 845020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1016064).

845020 is an abundant number, since it is smaller than the sum of its proper divisors (1187108).

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

845020 is a wasteful number, since it uses less digits than its factorization.

845020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 845020 is about 919.2496940440. The cubic root of 845020 is about 94.5414653373.

Adding to 845020 its reverse (20548), we get a palindrome (865568).

The spelling of 845020 in words is "eight hundred forty-five thousand, twenty".