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20893 = 171229

20893 has 4 divisors (see below), whose sum is σ = 22140. Its totient is φ = 19648.

The previous prime is 20887. The next prime is 20897. The reversal of 20893 is 39802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19044 + 1849 = 138^2 + 43^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20893 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 Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20897) 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, 598 + ... + 631.

It is an arithmetic number, because the mean of its divisors is an integer number (5535).

220893 is an apocalyptic number.

It is an amenable number.

20893 is a deficient number, since it is larger than the sum of its proper divisors (1247).

20893 is a wasteful number, since it uses less digits than its factorization.

20893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 20893 is about 144.5441109143. The cubic root of 20893 is about 27.5423040351.

The spelling of 20893 in words is "twenty thousand, eight hundred ninety-three".

Divisors: 1 17 1229 20893