20449228 has 6 divisors (see below), whose sum is σ = 35786156. Its totient is φ = 10224612.

The previous prime is 20449211. The next prime is 20449241. The reversal of 20449228 is 82294402.

It is a self number, because there is not a number n which added to its sum of digits gives 20449228.

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 as a sum of consecutive naturals, namely, 2556150 + ... + 2556157.

Almost surely, 2^20449228 is an apocalyptic number.

It is an amenable number.

20449228 is a deficient number, since it is larger than the sum of its proper divisors (15336928).

20449228 is a wasteful number, since it uses less digits than its factorization.

20449228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5112311 (or 5112309 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20449228 is about 4522.0822637365. The cubic root of 20449228 is about 273.4590531452.

The spelling of 20449228 in words is "twenty million, four hundred forty-nine thousand, two hundred twenty-eight".