12605220 has 120 divisors (see below), whose sum is σ = 40981248. Its totient is φ = 3240000.

The previous prime is 12605207. The next prime is 12605221. The reversal of 12605220 is 2250621.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12605193 and 12605202.

It is not an unprimeable number, because it can be changed into a prime (12605221) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 50095 + ... + 50345.

Almost surely, 2^12605220 is an apocalyptic number.

12605220 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 12605220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20490624).

12605220 is an abundant number, since it is smaller than the sum of its proper divisors (28376028).

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

12605220 is a wasteful number, since it uses less digits than its factorization.

12605220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 12605220 is about 3550.3830779227. The cubic root of 12605220 is about 232.7288070115.

Adding to 12605220 its reverse (2250621), we get a palindrome (14855841).

The spelling of 12605220 in words is "twelve million, six hundred five thousand, two hundred twenty".