2018181820 has 12 divisors (see below), whose sum is σ = 4238181864. Its totient is φ = 807272720.

The previous prime is 2018181791. The next prime is 2018181829. The reversal of 2018181820 is 281818102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2018181829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50454526 + ... + 50454565.

It is an arithmetic number, because the mean of its divisors is an integer number (353181822).

Almost surely, 2^2018181820 is an apocalyptic number.

2018181820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2018181820 is an abundant number, since it is smaller than the sum of its proper divisors (2220000044).

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

2018181820 is a wasteful number, since it uses less digits than its factorization.

2018181820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100909100 (or 100909098 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 2018181820 is about 44924.1785678937. The cubic root of 2018181820 is about 1263.7274814070.

Adding to 2018181820 its reverse (281818102), we get a palindrome (2299999922).

The spelling of 2018181820 in words is "two billion, eighteen million, one hundred eighty-one thousand, eight hundred twenty".