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20473 = 59347

20473 has 4 divisors (see below), whose sum is σ = 20880. Its totient is φ = 20068.

The previous prime is 20443. The next prime is 20477. The reversal of 20473 is 37402.

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 = 218701.

It is a cyclic number.

It is not a de Polignac number, because 20473 - 25 = 20441 is a prime.

It is a Duffinian number.

It is a plaindrome in base 7.

It is a nialpdrome in base 12 and base 14.

It is not an unprimeable number, because it can be changed into a prime (20477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115 + ... + 232.

It is an arithmetic number, because the mean of its divisors is an integer number (5220).

220473 is an apocalyptic number.

It is an amenable number.

20473 is a deficient number, since it is larger than the sum of its proper divisors (407).

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 product of its (nonzero) digits is 168, while the sum is 16.

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.

Divisors: 1 59 347 20473