12020345 has 4 divisors (see below), whose sum is σ = 14424420. Its totient is φ = 9616272.

The previous prime is 12020341. The next prime is 12020363. The reversal of 12020345 is 54302021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54302021 = 3617 ⋅15013.

It can be written as a sum of positive squares in 2 ways, for example, as 4380649 + 7639696 = 2093^2 + 2764^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020345 - 2² = 12020341 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12020341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1202030 + ... + 1202039.

It is an arithmetic number, because the mean of its divisors is an integer number (3606105).

Almost surely, 2^12020345 is an apocalyptic number.

It is an amenable number.

12020345 is a deficient number, since it is larger than the sum of its proper divisors (2404075).

12020345 is an equidigital number, since it uses as much as digits as its factorization.

12020345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404074.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 12020345 is about 3467.0369193304. The cubic root of 12020345 is about 229.0721599663.

Adding to 12020345 its reverse (54302021), we get a palindrome (66322366).

The spelling of 12020345 in words is "twelve million, twenty thousand, three hundred forty-five".