12051820 has 48 divisors (see below), whose sum is σ = 28576800. Its totient is φ = 4229120.

The previous prime is 12051811. The next prime is 12051841. The reversal of 12051820 is 2815021.

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, 5436 + ... + 7324.

It is an arithmetic number, because the mean of its divisors is an integer number (595350).

Almost surely, 2^12051820 is an apocalyptic number.

12051820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12051820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14288400).

12051820 is an abundant number, since it is smaller than the sum of its proper divisors (16524980).

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

12051820 is a wasteful number, since it uses less digits than its factorization.

12051820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1938 (or 1936 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 12051820 is about 3471.5731304410. The cubic root of 12051820 is about 229.2719257872.

Adding to 12051820 its reverse (2815021), we get a palindrome (14866841).

It can be divided in two parts, 1205 and 1820, that added together give a square (3025 = 55²).

The spelling of 12051820 in words is "twelve million, fifty-one thousand, eight hundred twenty".