12180220 has 48 divisors (see below), whose sum is σ = 27941760. Its totient is φ = 4432896.

The previous prime is 12180209. The next prime is 12180221. The reversal of 12180220 is 2208121.

12180220 = T₃₁₁ + T₃₁₂ + ... + T₄₆₈.

It is a junction number, because it is equal to n+sod(n) for n = 12180194 and 12180203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12180221) 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, 20244 + ... + 20836.

It is an arithmetic number, because the mean of its divisors is an integer number (582120).

Almost surely, 2^12180220 is an apocalyptic number.

12180220 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 12180220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13970880).

12180220 is an abundant number, since it is smaller than the sum of its proper divisors (15761540).

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

12180220 is a wasteful number, since it uses less digits than its factorization.

12180220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 692 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 12180220 is about 3490.0171919347. The cubic root of 12180220 is about 230.0832716751.

Adding to 12180220 its reverse (2208121), we get a palindrome (14388341).

The spelling of 12180220 in words is "twelve million, one hundred eighty thousand, two hundred twenty".