812020 has 24 divisors (see below), whose sum is σ = 1860768. Its totient is φ = 295200.

The previous prime is 812011. The next prime is 812033. The reversal of 812020 is 20218.

It is a congruent number.

It is an unprimeable number.

812020 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 1626 + ... + 2065.

It is an arithmetic number, because the mean of its divisors is an integer number (77532).

2⁸¹²⁰²⁰ is an apocalyptic number.

It is an amenable number.

812020 is an abundant number, since it is smaller than the sum of its proper divisors (1048748).

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

812020 is a wasteful number, since it uses less digits than its factorization.

812020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3711 (or 3709 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 812020 is about 901.1215234362. The cubic root of 812020 is about 93.2943998612.

Adding to 812020 its reverse (20218), we get a palindrome (832238).

The spelling of 812020 in words is "eight hundred twelve thousand, twenty".