842020 has 12 divisors (see below), whose sum is σ = 1768284. Its totient is φ = 336800.

The previous prime is 842003. The next prime is 842021. The reversal of 842020 is 20248.

It can be written as a sum of positive squares in 2 ways, for example, as 484416 + 357604 = 696^2 + 598^2 .

It is a junction number, because it is equal to n+sod(n) for n = 841985 and 842003.

It is not an unprimeable number, because it can be changed into a prime (842021) by changing a digit.

842020 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 3 ways as a sum of consecutive naturals, for example, 21031 + ... + 21070.

It is an arithmetic number, because the mean of its divisors is an integer number (147357).

2⁸⁴²⁰²⁰ is an apocalyptic number.

It is an amenable number.

842020 is an abundant number, since it is smaller than the sum of its proper divisors (926264).

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

842020 is a wasteful number, since it uses less digits than its factorization.

842020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42110 (or 42108 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 842020 is about 917.6164776201. The cubic root of 842020 is about 94.4294519326.

Adding to 842020 its reverse (20248), we get a palindrome (862268).

The spelling of 842020 in words is "eight hundred forty-two thousand, twenty".