801820 has 24 divisors (see below), whose sum is σ = 1721664. Its totient is φ = 313536.

The previous prime is 801817. The next prime is 801833. The reversal of 801820 is 28108.

It is a happy number.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514 + ... + 1366.

It is an arithmetic number, because the mean of its divisors is an integer number (71736).

2⁸⁰¹⁸²⁰ is an apocalyptic number.

It is an amenable number.

801820 is an abundant number, since it is smaller than the sum of its proper divisors (919844).

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

801820 is a wasteful number, since it uses less digits than its factorization.

801820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909 (or 907 counting only the distinct ones).

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

The square root of 801820 is about 895.4440239345. Note that the first 3 decimals coincide. The cubic root of 801820 is about 92.9021207856.

Adding to 801820 its reverse (28108), we get a palindrome (829928).

The spelling of 801820 in words is "eight hundred one thousand, eight hundred twenty".