20255 has 4 divisors (see below), whose sum is σ = 24312. Its totient is φ = 16200.

The previous prime is 20249. The next prime is 20261. The reversal of 20255 is 55202.

20255 = 10² + 11² + ... + 39².

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

It is an interprime number because it is at equal distance from previous prime (20249) and next prime (20261).

It is not a de Polignac number, because 20255 - 2¹⁰ = 19231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20255.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021 + ... + 2030.

It is an arithmetic number, because the mean of its divisors is an integer number (6078).

2²⁰²⁵⁵ is an apocalyptic number.

20255 is a deficient number, since it is larger than the sum of its proper divisors (4057).

20255 is an equidigital number, since it uses as much as digits as its factorization.

20255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056.

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 20255 is about 142.3200618325. The cubic root of 20255 is about 27.2590520666.

Adding to 20255 its reverse (55202), we get a palindrome (75457).

The spelling of 20255 in words is "twenty thousand, two hundred fifty-five".