12820143 has 32 divisors (see below), whose sum is σ = 20643840. Its totient is φ = 6922080.

The previous prime is 12820133. The next prime is 12820151. The reversal of 12820143 is 34102821.

It is not a de Polignac number, because 12820143 - 2⁴ = 12820127 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12820133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30388 + ... + 30806.

It is an arithmetic number, because the mean of its divisors is an integer number (645120).

Almost surely, 2^12820143 is an apocalyptic number.

12820143 is a deficient number, since it is larger than the sum of its proper divisors (7823697).

12820143 is a wasteful number, since it uses less digits than its factorization.

12820143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 12820143 is about 3580.5227272006. The cubic root of 12820143 is about 234.0440599334.

Adding to 12820143 its reverse (34102821), we get a palindrome (46922964).

The spelling of 12820143 in words is "twelve million, eight hundred twenty thousand, one hundred forty-three".