20073 has 4 divisors (see below), whose sum is σ = 26768. Its totient is φ = 13380.

The previous prime is 20071. The next prime is 20089. The reversal of 20073 is 37002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20073 - 2¹ = 20071 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (20071) 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, 3343 + ... + 3348.

It is an arithmetic number, because the mean of its divisors is an integer number (6692).

2²⁰⁰⁷³ is an apocalyptic number.

It is an amenable number.

20073 is a deficient number, since it is larger than the sum of its proper divisors (6695).

20073 is an equidigital number, since it uses as much as digits as its factorization.

20073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6694.

The product of its (nonzero) digits is 42, while the sum is 12.

The square root of 20073 is about 141.6792151305. The cubic root of 20073 is about 27.1771614806.

Adding to 20073 its reverse (37002), we get a palindrome (57075).

The spelling of 20073 in words is "twenty thousand, seventy-three", and thus it is an iban number.