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20941 = 43487
BaseRepresentation
bin101000111001101
31001201121
411013031
51132231
6240541
7115024
oct50715
931647
1020941
1114808
1210151
1396bb
1478bb
156311
hex51cd

20941 has 4 divisors (see below), whose sum is σ = 21472. Its totient is φ = 20412.

The previous prime is 20939. The next prime is 20947. The reversal of 20941 is 14902.

It can be divided in two parts, 20 and 941, that added together give a square (961 = 312).

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: 14902 = 27451.

It is a cyclic number.

It is not a de Polignac number, because 20941 - 21 = 20939 is a prime.

It is a Duffinian number.

20941 is a lucky number.

It is a plaindrome in base 14.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20947) 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, 201 + ... + 286.

It is an arithmetic number, because the mean of its divisors is an integer number (5368).

220941 is an apocalyptic number.

It is an amenable number.

20941 is a deficient number, since it is larger than the sum of its proper divisors (531).

20941 is an equidigital number, since it uses as much as digits as its factorization.

20941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 20941 is about 144.7100549375. The cubic root of 20941 is about 27.5633799850.

The spelling of 20941 in words is "twenty thousand, nine hundred forty-one".

Divisors: 1 43 487 20941