20492228 has 12 divisors (see below), whose sum is σ = 36830892. Its totient is φ = 9969120.

The previous prime is 20492201. The next prime is 20492231. The reversal of 20492228 is 82229402.

It can be written as a sum of positive squares in 2 ways, for example, as 13191424 + 7300804 = 3632^2 + 2702^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20492228.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69083 + ... + 69378.

It is an arithmetic number, because the mean of its divisors is an integer number (3069241).

Almost surely, 2^20492228 is an apocalyptic number.

It is an amenable number.

20492228 is a deficient number, since it is larger than the sum of its proper divisors (16338664).

20492228 is a wasteful number, since it uses less digits than its factorization.

20492228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138502 (or 138500 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20492228 is about 4526.8342138850. The cubic root of 20492228 is about 273.6505926812.

The spelling of 20492228 in words is "twenty million, four hundred ninety-two thousand, two hundred twenty-eight".