810802020 has 72 divisors (see below), whose sum is σ = 2640907584. Its totient is φ = 185325504.

The previous prime is 810802001. The next prime is 810802033. The reversal of 810802020 is 20208018.

810802020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134952 + ... + 140831.

It is an arithmetic number, because the mean of its divisors is an integer number (36679272).

Almost surely, 2^810802020 is an apocalyptic number.

It is an amenable number.

810802020 is an abundant number, since it is smaller than the sum of its proper divisors (1830105564).

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

810802020 is a wasteful number, since it uses less digits than its factorization.

810802020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275809 (or 275800 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 810802020 is about 28474.5855105917. The cubic root of 810802020 is about 932.4773123495.

The spelling of 810802020 in words is "eight hundred ten million, eight hundred two thousand, twenty".