12020661 has 12 divisors (see below), whose sum is σ = 17434092. Its totient is φ = 7981056.

The previous prime is 12020647. The next prime is 12020681. The reversal of 12020661 is 16602021.

It is a happy number.

12020661 is a `hidden beast` number, since 1 + 2 + 0 + 2 + 0 + 661 = 666.

12020661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 9492561 + 2528100 = 3081^2 + 1590^2 .

It is not a de Polignac number, because 12020661 - 2¹¹ = 12018613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12020611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286 + ... + 4911.

It is an arithmetic number, because the mean of its divisors is an integer number (1452841).

Almost surely, 2^12020661 is an apocalyptic number.

It is an amenable number.

12020661 is a deficient number, since it is larger than the sum of its proper divisors (5413431).

12020661 is a wasteful number, since it uses less digits than its factorization.

12020661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5460 (or 5457 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 12020661 is about 3467.0824910867. The cubic root of 12020661 is about 229.0741672899.

Adding to 12020661 its reverse (16602021), we get a palindrome (28622682).

The spelling of 12020661 in words is "twelve million, twenty thousand, six hundred sixty-one".