12920228 has 12 divisors (see below), whose sum is σ = 23800560. Its totient is φ = 6120072.

The previous prime is 12920203. The next prime is 12920239. The reversal of 12920228 is 82202921.

It is a junction number, because it is equal to n+sod(n) for n = 12920197 and 12920206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84926 + ... + 85077.

It is an arithmetic number, because the mean of its divisors is an integer number (1983380).

Almost surely, 2^12920228 is an apocalyptic number.

It is an amenable number.

12920228 is a deficient number, since it is larger than the sum of its proper divisors (10880332).

12920228 is a wasteful number, since it uses less digits than its factorization.

12920228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170026 (or 170024 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 12920228 is about 3594.4718666308. The cubic root of 12920228 is about 234.6515312136.

The spelling of 12920228 in words is "twelve million, nine hundred twenty thousand, two hundred twenty-eight".