809730020 has 48 divisors (see below), whose sum is σ = 1859760000. Its totient is φ = 293694720.

The previous prime is 809730017. The next prime is 809730037. The reversal of 809730020 is 20037908.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85481 + ... + 94479.

It is an arithmetic number, because the mean of its divisors is an integer number (38745000).

Almost surely, 2^809730020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 809730020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (929880000).

809730020 is an abundant number, since it is smaller than the sum of its proper divisors (1050029980).

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

809730020 is a wasteful number, since it uses less digits than its factorization.

809730020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9428 (or 9426 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 809730020 is about 28455.7554810973. The cubic root of 809730020 is about 932.0661735328.

Adding to 809730020 its reverse (20037908), we get a palindrome (829767928).

The spelling of 809730020 in words is "eight hundred nine million, seven hundred thirty thousand, twenty".