811836020 has 24 divisors (see below), whose sum is σ = 1805142024. Its totient is φ = 305632256.

The previous prime is 811835989. The next prime is 811836023. The reversal of 811836020 is 20638118.

It can be written as a sum of positive squares in 4 ways, for example, as 107039716 + 704796304 = 10346^2 + 26548^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811836023) by changing a digit.

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, 1193537 + ... + 1194216.

It is an arithmetic number, because the mean of its divisors is an integer number (75214251).

Almost surely, 2^811836020 is an apocalyptic number.

It is an amenable number.

811836020 is an abundant number, since it is smaller than the sum of its proper divisors (993306004).

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

811836020 is a wasteful number, since it uses less digits than its factorization.

811836020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387779 (or 2387777 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 811836020 is about 28492.7362673366. The cubic root of 811836020 is about 932.8735340082.

The spelling of 811836020 in words is "eight hundred eleven million, eight hundred thirty-six thousand, twenty".