12666620 has 24 divisors (see below), whose sum is σ = 27518400. Its totient is φ = 4891712.

The previous prime is 12666607. The next prime is 12666671. The reversal of 12666620 is 2666621.

12666620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (29).

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, 10340 + ... + 11499.

It is an arithmetic number, because the mean of its divisors is an integer number (1146600).

Almost surely, 2^12666620 is an apocalyptic number.

12666620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12666620 is an abundant number, since it is smaller than the sum of its proper divisors (14851780).

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

12666620 is a wasteful number, since it uses less digits than its factorization.

12666620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21877 (or 21875 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 12666620 is about 3559.0195279037. The cubic root of 12666620 is about 233.1060689680.

Subtracting from 12666620 its reverse (2666621), we obtain a palindrome (9999999).

The spelling of 12666620 in words is "twelve million, six hundred sixty-six thousand, six hundred twenty".