20253 has 8 divisors (see below), whose sum is σ = 27808. Its totient is φ = 13104.

The previous prime is 20249. The next prime is 20261. The reversal of 20253 is 35202.

20253 is nontrivially palindromic in base 9.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20253 - 2² = 20249 is a prime.

It is a Duffinian number.

It is a Curzon number.

20253 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51 + ... + 207.

It is an arithmetic number, because the mean of its divisors is an integer number (3476).

2²⁰²⁵³ is an apocalyptic number.

It is an amenable number.

20253 is a deficient number, since it is larger than the sum of its proper divisors (7555).

20253 is a wasteful number, since it uses less digits than its factorization.

20253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203.

The product of its (nonzero) digits is 60, while the sum is 12.

The square root of 20253 is about 142.3130352427. The cubic root of 20253 is about 27.2581548413.

Adding to 20253 its reverse (35202), we get a palindrome (55455).

The spelling of 20253 in words is "twenty thousand, two hundred fifty-three".