20269 has 2 divisors, whose sum is σ = 20270. Its totient is φ = 20268.

The previous prime is 20261. The next prime is 20287. The reversal of 20269 is 96202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19044 + 1225 = 138^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 20269 - 2³ = 20261 is a prime.

It is a super-2 number, since 2×20269² = 821664722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10134 + 10135.

It is an arithmetic number, because the mean of its divisors is an integer number (10135).

2²⁰²⁶⁹ is an apocalyptic number.

It is an amenable number.

20269 is a deficient number, since it is larger than the sum of its proper divisors (1).

20269 is an equidigital number, since it uses as much as digits as its factorization.

20269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 20269 is about 142.3692382504. The cubic root of 20269 is about 27.2653309910.

It can be divided in two parts, 20 and 269, that added together give a square (289 = 17²).

The spelling of 20269 in words is "twenty thousand, two hundred sixty-nine".