20695 has 4 divisors (see below), whose sum is σ = 24840. Its totient is φ = 16552.

The previous prime is 20693. The next prime is 20707. The reversal of 20695 is 59602.

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

It is a cyclic number.

It is not a de Polignac number, because 20695 - 2¹ = 20693 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2065 + ... + 2074.

It is an arithmetic number, because the mean of its divisors is an integer number (6210).

2²⁰⁶⁹⁵ is an apocalyptic number.

20695 is a deficient number, since it is larger than the sum of its proper divisors (4145).

20695 is an equidigital number, since it uses as much as digits as its factorization.

20695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4144.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 20695 is about 143.8575684488. The cubic root of 20695 is about 27.4550228974.

The spelling of 20695 in words is "twenty thousand, six hundred ninety-five".