20566255 has 16 divisors (see below), whose sum is σ = 26357760. Its totient is φ = 15367968.

The previous prime is 20566241. The next prime is 20566267. The reversal of 20566255 is 55266502.

It is a cyclic number.

It is not a de Polignac number, because 20566255 - 2¹¹ = 20564207 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2866 + ... + 7024.

It is an arithmetic number, because the mean of its divisors is an integer number (1647360).

Almost surely, 2^20566255 is an apocalyptic number.

20566255 is a deficient number, since it is larger than the sum of its proper divisors (5791505).

20566255 is a wasteful number, since it uses less digits than its factorization.

20566255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4230.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 20566255 is about 4535.0033076063. The cubic root of 20566255 is about 273.9797123878.

The spelling of 20566255 in words is "twenty million, five hundred sixty-six thousand, two hundred fifty-five".