20569253 has 2 divisors, whose sum is σ = 20569254. Its totient is φ = 20569252.

The previous prime is 20569231. The next prime is 20569259. The reversal of 20569253 is 35296502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19651489 + 917764 = 4433^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 20569253 - 2¹² = 20565157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20569259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10284626 + 10284627.

It is an arithmetic number, because the mean of its divisors is an integer number (10284627).

Almost surely, 2^20569253 is an apocalyptic number.

It is an amenable number.

20569253 is a deficient number, since it is larger than the sum of its proper divisors (1).

20569253 is an equidigital number, since it uses as much as digits as its factorization.

20569253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 20569253 is about 4535.3338355627. Note that the first 3 decimals coincide. The cubic root of 20569253 is about 273.9930246684.

The spelling of 20569253 in words is "twenty million, five hundred sixty-nine thousand, two hundred fifty-three".