8091820 has 24 divisors (see below), whose sum is σ = 18538128. Its totient is φ = 2942400.

The previous prime is 8091803. The next prime is 8091821. The reversal of 8091820 is 281908.

It is not an unprimeable number, because it can be changed into a prime (8091821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18171 + ... + 18610.

It is an arithmetic number, because the mean of its divisors is an integer number (772422).

Almost surely, 2^8091820 is an apocalyptic number.

It is an amenable number.

8091820 is an abundant number, since it is smaller than the sum of its proper divisors (10446308).

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

8091820 is a wasteful number, since it uses less digits than its factorization.

8091820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36801 (or 36799 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 8091820 is about 2844.6124516355. The cubic root of 8091820 is about 200.7622577911.

It can be divided in two parts, 8091 and 820, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 8091820 in words is "eight million, ninety-one thousand, eight hundred twenty".