12820420 has 24 divisors (see below), whose sum is σ = 27002304. Its totient is φ = 5113056.

The previous prime is 12820373. The next prime is 12820427. The reversal of 12820420 is 2402821.

It is not an unprimeable number, because it can be changed into a prime (12820427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8137 + ... + 9583.

It is an arithmetic number, because the mean of its divisors is an integer number (1125096).

Almost surely, 2^12820420 is an apocalyptic number.

12820420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12820420 is an abundant number, since it is smaller than the sum of its proper divisors (14181884).

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

12820420 is a wasteful number, since it uses less digits than its factorization.

12820420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899 (or 1897 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 12820420 is about 3580.5614084945. The cubic root of 12820420 is about 234.0457455552.

The spelling of 12820420 in words is "twelve million, eight hundred twenty thousand, four hundred twenty".