12018820 has 24 divisors (see below), whose sum is σ = 27534528. Its totient is φ = 4370400.

The previous prime is 12018817. The next prime is 12018833. The reversal of 12018820 is 2881021.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 12018791 and 12018800.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 27096 + ... + 27535.

It is an arithmetic number, because the mean of its divisors is an integer number (1147272).

Almost surely, 2^12018820 is an apocalyptic number.

12018820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12018820 is an abundant number, since it is smaller than the sum of its proper divisors (15515708).

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

12018820 is a wasteful number, since it uses less digits than its factorization.

12018820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54651 (or 54649 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 12018820 is about 3466.8169839206. The cubic root of 12018820 is about 229.0624722294.

Adding to 12018820 its reverse (2881021), we get a palindrome (14899841).

The spelling of 12018820 in words is "twelve million, eighteen thousand, eight hundred twenty".