870020 has 24 divisors (see below), whose sum is σ = 1873368. Its totient is φ = 339200.

The previous prime is 870013. The next prime is 870031. The reversal of 870020 is 20078.

It can be written as a sum of positive squares in 4 ways, for example, as 12544 + 857476 = 112^2 + 926^2 .

It is a congruent number.

It is an unprimeable number.

870020 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 290 + ... + 1350.

It is an arithmetic number, because the mean of its divisors is an integer number (78057).

2⁸⁷⁰⁰²⁰ 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 870020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936684).

870020 is an abundant number, since it is smaller than the sum of its proper divisors (1003348).

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

870020 is a wasteful number, since it uses less digits than its factorization.

870020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111 (or 1109 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 870020 is about 932.7486263726. The cubic root of 870020 is about 95.4647586131.

Adding to 870020 its reverse (20078), we get a palindrome (890098).

The spelling of 870020 in words is "eight hundred seventy thousand, twenty".