12020857 has 4 divisors (see below), whose sum is σ = 12028660. Its totient is φ = 12013056.

The previous prime is 12020851. The next prime is 12020903. The reversal of 12020857 is 75802021.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4923961 + 7096896 = 2219^2 + 2664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12020857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12020851) 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, 732 + ... + 4957.

It is an arithmetic number, because the mean of its divisors is an integer number (3007165).

Almost surely, 2^12020857 is an apocalyptic number.

It is an amenable number.

12020857 is a deficient number, since it is larger than the sum of its proper divisors (7803).

12020857 is an equidigital number, since it uses as much as digits as its factorization.

12020857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7802.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 12020857 is about 3467.1107568118. The cubic root of 12020857 is about 229.0754123211.

Adding to 12020857 its reverse (75802021), we get a palindrome (87822878).

The spelling of 12020857 in words is "twelve million, twenty thousand, eight hundred fifty-seven".