818020 has 24 divisors (see below), whose sum is σ = 1963584. Its totient is φ = 280416.

The previous prime is 818017. The next prime is 818021. The reversal of 818020 is 20818.

It is a happy number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (818021) 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 7 ways as a sum of consecutive naturals, for example, 2782 + ... + 3061.

It is an arithmetic number, because the mean of its divisors is an integer number (81816).

2⁸¹⁸⁰²⁰ is an apocalyptic number.

It is an amenable number.

818020 is an abundant number, since it is smaller than the sum of its proper divisors (1145564).

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

818020 is a wasteful number, since it uses less digits than its factorization.

818020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5859 (or 5857 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 818020 is about 904.4445809446. Note that the first 3 decimals coincide. The cubic root of 818020 is about 93.5236197203.

Adding to 818020 its reverse (20818), we get a palindrome (838838).

The spelling of 818020 in words is "eight hundred eighteen thousand, twenty".