20657223 has 24 divisors (see below), whose sum is σ = 30640896. Its totient is φ = 13406400.

The previous prime is 20657209. The next prime is 20657233. The reversal of 20657223 is 32275602.

20657223 is a `hidden beast` number, since 2 + 0 + 657 + 2 + 2 + 3 = 666.

It is not a de Polignac number, because 20657223 - 2¹⁷ = 20526151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20657233) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 104761 + ... + 104957.

It is an arithmetic number, because the mean of its divisors is an integer number (1276704).

Almost surely, 2^20657223 is an apocalyptic number.

20657223 is a deficient number, since it is larger than the sum of its proper divisors (9983673).

20657223 is a wasteful number, since it uses less digits than its factorization.

20657223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 20657223 is about 4545.0217821260. The cubic root of 20657223 is about 274.3830710245.

The spelling of 20657223 in words is "twenty million, six hundred fifty-seven thousand, two hundred twenty-three".