12320220 has 72 divisors (see below), whose sum is σ = 37940112. Its totient is φ = 2984960.

The previous prime is 12320219. The next prime is 12320239. The reversal of 12320220 is 2202321.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12320196 and 12320205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6412 + ... + 8108.

It is an arithmetic number, because the mean of its divisors is an integer number (526946).

Almost surely, 2^12320220 is an apocalyptic number.

12320220 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 12320220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18970056).

12320220 is an abundant number, since it is smaller than the sum of its proper divisors (25619892).

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

12320220 is a wasteful number, since it uses less digits than its factorization.

12320220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731 (or 1718 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 12320220 is about 3510.0170939755. The cubic root of 12320220 is about 230.9614448124.

Adding to 12320220 its reverse (2202321), we get a palindrome (14522541).

The spelling of 12320220 in words is "twelve million, three hundred twenty thousand, two hundred twenty".