4431811820 has 12 divisors (see below), whose sum is σ = 9306804864. Its totient is φ = 1772724720.

The previous prime is 4431811819. The next prime is 4431811829. The reversal of 4431811820 is 281181344.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (4431811829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110795276 + ... + 110795315.

It is an arithmetic number, because the mean of its divisors is an integer number (775567072).

Almost surely, 2^4431811820 is an apocalyptic number.

It is an amenable number.

4431811820 is an abundant number, since it is smaller than the sum of its proper divisors (4874993044).

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

4431811820 is a wasteful number, since it uses less digits than its factorization.

4431811820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221590600 (or 221590598 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 4431811820 is about 66571.8545633213. The cubic root of 4431811820 is about 1642.5821681327.

The spelling of 4431811820 in words is "four billion, four hundred thirty-one million, eight hundred eleven thousand, eight hundred twenty".