12920056 has 32 divisors (see below), whose sum is σ = 25459200. Its totient is φ = 6138720.

The previous prime is 12920023. The next prime is 12920071. The reversal of 12920056 is 65002921.

It is a self number, because there is not a number n which added to its sum of digits gives 12920056.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14191 + ... + 15073.

It is an arithmetic number, because the mean of its divisors is an integer number (795600).

Almost surely, 2^12920056 is an apocalyptic number.

It is an amenable number.

12920056 is a deficient number, since it is larger than the sum of its proper divisors (12539144).

12920056 is a wasteful number, since it uses less digits than its factorization.

12920056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 12920056 is about 3594.4479409222. The cubic root of 12920056 is about 234.6504899461.

Adding to 12920056 its reverse (65002921), we get a palindrome (77922977).

The spelling of 12920056 in words is "twelve million, nine hundred twenty thousand, fifty-six".