20565224 has 16 divisors (see below), whose sum is σ = 38758500. Its totient is φ = 10229632.

The previous prime is 20565211. The next prime is 20565247. The reversal of 20565224 is 42256502.

It can be written as a sum of positive squares in 2 ways, for example, as 18062500 + 2502724 = 4250^2 + 1582^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20565193 and 20565202.

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, 4949 + ... + 8100.

Almost surely, 2^20565224 is an apocalyptic number.

It is an amenable number.

20565224 is a deficient number, since it is larger than the sum of its proper divisors (18193276).

20565224 is a wasteful number, since it uses less digits than its factorization.

20565224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13252 (or 13248 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20565224 is about 4534.8896348202. The cubic root of 20565224 is about 273.9751340498.

The spelling of 20565224 in words is "twenty million, five hundred sixty-five thousand, two hundred twenty-four".