20473 is nontrivially palindromic in base 2.
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, and also an emirpimes, since its reverse is a distinct semiprime: 37402 = 2 ⋅18701.
It is a cyclic number.
It is a Duffinian number.
It is a plaindrome in base 7.
It is a nialpdrome in base 12 and base 14.
220473 is an apocalyptic number.
It is an amenable number.
20473 is an equidigital number, since it uses as much as digits as its factorization.
20473 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 406.
The square root of 20473 is about 143.0838914763. The cubic root of 20473 is about 27.3564976480.
Adding to 20473 its reverse (37402), we get a palindrome (57875).
The spelling of 20473 in words is "twenty thousand, four hundred seventy-three", and thus it is an iban number.