20541 has 8 divisors (see below), whose sum is σ = 28224. Its totient is φ = 13280.

The previous prime is 20533. The next prime is 20543. The reversal of 20541 is 14502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20541 - 2³ = 20533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543) 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 7 ways as a sum of consecutive naturals, for example, 40 + ... + 206.

It is an arithmetic number, because the mean of its divisors is an integer number (3528).

2²⁰⁵⁴¹ is an apocalyptic number.

It is an amenable number.

20541 is a deficient number, since it is larger than the sum of its proper divisors (7683).

20541 is a wasteful number, since it uses less digits than its factorization.

20541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 20541 is about 143.3213173258. The cubic root of 20541 is about 27.3867519026.

It can be divided in two parts, 20 and 541, that added together give a triangular number (561 = T₃₃).

The spelling of 20541 in words is "twenty thousand, five hundred forty-one".