20842228 has 24 divisors (see below), whose sum is σ = 40065984. Its totient is φ = 9408000.

The previous prime is 20842219. The next prime is 20842243. The reversal of 20842228 is 82224802.

It is a junction number, because it is equal to n+sod(n) for n = 20842196 and 20842205.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 5076 + ... + 8212.

It is an arithmetic number, because the mean of its divisors is an integer number (1669416).

Almost surely, 2^20842228 is an apocalyptic number.

It is an amenable number.

20842228 is a deficient number, since it is larger than the sum of its proper divisors (19223756).

20842228 is a wasteful number, since it uses less digits than its factorization.

20842228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303 (or 3301 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 20842228 is about 4565.3289038141. The cubic root of 20842228 is about 275.1997578926.

It can be divided in two parts, 208 and 42228, that added together give a square (42436 = 206²).

The spelling of 20842228 in words is "twenty million, eight hundred forty-two thousand, two hundred twenty-eight".