805020500 has 96 divisors (see below), whose sum is σ = 1871251200. Its totient is φ = 301680000.

The previous prime is 805020473. The next prime is 805020509. The reversal of 805020500 is 5020508.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805020509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 959081 + ... + 959919.

It is an arithmetic number, because the mean of its divisors is an integer number (19492200).

Almost surely, 2^805020500 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 805020500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935625600).

805020500 is an abundant number, since it is smaller than the sum of its proper divisors (1066230700).

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

805020500 is a wasteful number, since it uses less digits than its factorization.

805020500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978 (or 966 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 805020500 is about 28372.8831809529. The cubic root of 805020500 is about 930.2556432910.

The spelling of 805020500 in words is "eight hundred five million, twenty thousand, five hundred".