815020 has 12 divisors (see below), whose sum is σ = 1711584. Its totient is φ = 326000.

The previous prime is 814991. The next prime is 815029. The reversal of 815020 is 20518.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 814985 and 815003.

It is not an unprimeable number, because it can be changed into a prime (815029) by changing a digit.

815020 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, 20356 + ... + 20395.

It is an arithmetic number, because the mean of its divisors is an integer number (142632).

2⁸¹⁵⁰²⁰ is an apocalyptic number.

It is an amenable number.

815020 is an abundant number, since it is smaller than the sum of its proper divisors (896564).

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

815020 is a wasteful number, since it uses less digits than its factorization.

815020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40760 (or 40758 counting only the distinct ones).

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

The square root of 815020 is about 902.7845811709. The cubic root of 815020 is about 93.4091504133.

Adding to 815020 its reverse (20518), we get a palindrome (835538).

The spelling of 815020 in words is "eight hundred fifteen thousand, twenty".