20755 has 8 divisors (see below), whose sum is σ = 28512. Its totient is φ = 14208.

The previous prime is 20753. The next prime is 20759. The reversal of 20755 is 55702.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20755 - 2¹ = 20753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20753) 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, 262 + ... + 331.

It is an arithmetic number, because the mean of its divisors is an integer number (3564).

2²⁰⁷⁵⁵ is an apocalyptic number.

20755 is a deficient number, since it is larger than the sum of its proper divisors (7757).

20755 is an equidigital number, since it uses as much as digits as its factorization.

20755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605.

The product of its (nonzero) digits is 350, while the sum is 19.

The square root of 20755 is about 144.0659571169. The cubic root of 20755 is about 27.4815302978.

Subtracting from 20755 its sum of digits (19), we obtain a 4-th power (20736 = 12⁴).

It can be divided in two parts, 2075 and 5, that added together give a triangular number (2080 = T₆₄).

The spelling of 20755 in words is "twenty thousand, seven hundred fifty-five".