20266 has 4 divisors (see below), whose sum is σ = 30402. Its totient is φ = 10132.

The previous prime is 20261. The next prime is 20269. The reversal of 20266 is 66202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14641 + 5625 = 121^2 + 75^2 .

It is not an unprimeable number, because it can be changed into a prime (20261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5065 + ... + 5068.

2²⁰²⁶⁶ is an apocalyptic number.

20266 is a deficient number, since it is larger than the sum of its proper divisors (10136).

20266 is a wasteful number, since it uses less digits than its factorization.

20266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10135.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20266 is about 142.3587018766. The cubic root of 20266 is about 27.2639857506.

Adding to 20266 its reverse (66202), we get a palindrome (86468).

The spelling of 20266 in words is "twenty thousand, two hundred sixty-six".