12820660 has 48 divisors (see below), whose sum is σ = 28740096. Its totient is φ = 4792832.

The previous prime is 12820657. The next prime is 12820679. The reversal of 12820660 is 6602821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21324 + ... + 21916.

It is an arithmetic number, because the mean of its divisors is an integer number (598752).

Almost surely, 2^12820660 is an apocalyptic number.

12820660 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 12820660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14370048).

12820660 is an abundant number, since it is smaller than the sum of its proper divisors (15919436).

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

12820660 is a wasteful number, since it uses less digits than its factorization.

12820660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 12820660 is about 3580.5949226351. The cubic root of 12820660 is about 234.0472060021.

The spelling of 12820660 in words is "twelve million, eight hundred twenty thousand, six hundred sixty".