20572228 has 12 divisors (see below), whose sum is σ = 36191232. Its totient is φ = 10231880.

The previous prime is 20572219. The next prime is 20572241. The reversal of 20572228 is 82227502.

It is a junction number, because it is equal to n+sod(n) for n = 20572196 and 20572205.

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 3 ways as a sum of consecutive naturals, for example, 12700 + ... + 14227.

It is an arithmetic number, because the mean of its divisors is an integer number (3015936).

Almost surely, 2^20572228 is an apocalyptic number.

It is an amenable number.

20572228 is a deficient number, since it is larger than the sum of its proper divisors (15619004).

20572228 is a wasteful number, since it uses less digits than its factorization.

20572228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27122 (or 27120 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 20572228 is about 4535.6618039708. The cubic root of 20572228 is about 274.0062335414.

The spelling of 20572228 in words is "twenty million, five hundred seventy-two thousand, two hundred twenty-eight".