810906020 has 24 divisors (see below), whose sum is σ = 1703789304. Its totient is φ = 324193536.

The previous prime is 810906011. The next prime is 810906043. The reversal of 810906020 is 20609018.

It can be written as a sum of positive squares in 4 ways, for example, as 1162084 + 809743936 = 1078^2 + 28456^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33254 + ... + 52226.

It is an arithmetic number, because the mean of its divisors is an integer number (70991221).

Almost surely, 2^810906020 is an apocalyptic number.

It is an amenable number.

810906020 is an abundant number, since it is smaller than the sum of its proper divisors (892883284).

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

810906020 is a wasteful number, since it uses less digits than its factorization.

810906020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21119 (or 21117 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 810906020 is about 28476.4116419186. The cubic root of 810906020 is about 932.5171796627.

The spelling of 810906020 in words is "eight hundred ten million, nine hundred six thousand, twenty".