12105820 has 24 divisors (see below), whose sum is σ = 26528544. Its totient is φ = 4631616.

The previous prime is 12105817. The next prime is 12105827. The reversal of 12105820 is 2850121.

12105820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12699 + ... + 13618.

It is an arithmetic number, because the mean of its divisors is an integer number (1105356).

Almost surely, 2^12105820 is an apocalyptic number.

12105820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12105820 is an abundant number, since it is smaller than the sum of its proper divisors (14422724).

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

12105820 is a wasteful number, since it uses less digits than its factorization.

12105820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26349 (or 26347 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 12105820 is about 3479.3418917951. The cubic root of 12105820 is about 229.6138447867.

Subtracting from 12105820 its product of nonzero digits (160), we obtain a triangular number (12105660 = T₄₉₂₀).

Adding to 12105820 its reverse (2850121), we get a palindrome (14955941).

The spelling of 12105820 in words is "twelve million, one hundred five thousand, eight hundred twenty".