12305220 has 48 divisors (see below), whose sum is σ = 34980288. Its totient is φ = 3231360.

The previous prime is 12305213. The next prime is 12305221. The reversal of 12305220 is 2250321.

12305220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12305220.

It is not an unprimeable number, because it can be changed into a prime (12305221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2490 + ... + 5550.

It is an arithmetic number, because the mean of its divisors is an integer number (728756).

Almost surely, 2^12305220 is an apocalyptic number.

12305220 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 12305220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17490144).

12305220 is an abundant number, since it is smaller than the sum of its proper divisors (22675068).

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

12305220 is a wasteful number, since it uses less digits than its factorization.

12305220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140 (or 3138 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 12305220 is about 3507.8797014721. The cubic root of 12305220 is about 230.8676740677.

Adding to 12305220 its reverse (2250321), we get a palindrome (14555541).

The spelling of 12305220 in words is "twelve million, three hundred five thousand, two hundred twenty".