12543220 has 24 divisors (see below), whose sum is σ = 27191808. Its totient is φ = 4855200.

The previous prime is 12543199. The next prime is 12543233. The reversal of 12543220 is 2234521.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9496 + ... + 10735.

It is an arithmetic number, because the mean of its divisors is an integer number (1132992).

Almost surely, 2^12543220 is an apocalyptic number.

12543220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12543220 is an abundant number, since it is smaller than the sum of its proper divisors (14648588).

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

12543220 is a wasteful number, since it uses less digits than its factorization.

12543220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20271 (or 20269 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 12543220 is about 3541.6408626511. The cubic root of 12543220 is about 232.3466132852.

Adding to 12543220 its reverse (2234521), we get a palindrome (14777741).

The spelling of 12543220 in words is "twelve million, five hundred forty-three thousand, two hundred twenty".