20217269 has 2 divisors, whose sum is σ = 20217270. Its totient is φ = 20217268.

The previous prime is 20217259. The next prime is 20217283. The reversal of 20217269 is 96271202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20133169 + 84100 = 4487^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 20217269 - 2²⁰ = 19168693 is a prime.

It is a super-2 number, since 2×20217269² = 817475931636722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (20217209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10108634 + 10108635.

It is an arithmetic number, because the mean of its divisors is an integer number (10108635).

Almost surely, 2^20217269 is an apocalyptic number.

It is an amenable number.

20217269 is a deficient number, since it is larger than the sum of its proper divisors (1).

20217269 is an equidigital number, since it uses as much as digits as its factorization.

20217269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20217269 is about 4496.3617514608. The cubic root of 20217269 is about 272.4211549801.

It can be divided in two parts, 202 and 17269, that added together give a palindrome (17471).

The spelling of 20217269 in words is "twenty million, two hundred seventeen thousand, two hundred sixty-nine".