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20041 = 72409
BaseRepresentation
bin100111001001001
31000111021
410321021
51120131
6232441
7112300
oct47111
930437
1020041
111406a
12b721
139178
147437
155e11
hex4e49

20041 has 6 divisors (see below), whose sum is σ = 23370. Its totient is φ = 17136.

The previous prime is 20029. The next prime is 20047. The reversal of 20041 is 14002.

It can be written as a sum of positive squares in only one way, i.e., 19600 + 441 = 140^2 + 21^2 .

It is not a de Polignac number, because 20041 - 27 = 19913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (20047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 156 + ... + 253.

It is an arithmetic number, because the mean of its divisors is an integer number (3895).

220041 is an apocalyptic number.

It is an amenable number.

20041 is a deficient number, since it is larger than the sum of its proper divisors (3329).

20041 is an equidigital number, since it uses as much as digits as its factorization.

20041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 20041 is about 141.5662389131. The cubic root of 20041 is about 27.1627120259.

Adding to 20041 its reverse (14002), we get a palindrome (34043).

The spelling of 20041 in words is "twenty thousand, forty-one", and thus it is an iban number.

Divisors: 1 7 49 409 2863 20041