20047 has 2 divisors, whose sum is σ = 20048.
Its totient is φ = 20046.
The previous prime is 20029. The next prime is 20051. The reversal of 20047 is 74002.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 20047 - 27 = 19919 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (20147) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10023 + 10024.
It is an arithmetic number, because the mean of its divisors is an integer number (10024).
220047 is an apocalyptic number.
20047 is a deficient number, since it is larger than the sum of its proper divisors (1).
20047 is an equidigital number, since it uses as much as digits as its factorization.
20047 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 56, while the sum is 13.
The square root of 20047 is about 141.5874288205.
The cubic root of 20047 is about 27.1654224697.
Subtracting from 20047 its product of nonzero digits (56), we obtain a palindrome (19991).
Adding to 20047 its reverse (74002), we get a palindrome (94049).
It can be divided in two parts, 2004 and 7, that multiplied together give a triangular number (14028 = T167).
The spelling of 20047 in words is "twenty thousand, forty-seven", and thus it is an iban number.