20541533 has 4 divisors (see below), whose sum is σ = 21042588. Its totient is φ = 20040480.

The previous prime is 20541523. The next prime is 20541557. The reversal of 20541533 is 33514502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 273529 + 20268004 = 523^2 + 4502^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20541533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20541499 and 20541508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250466 + ... + 250547.

It is an arithmetic number, because the mean of its divisors is an integer number (5260647).

Almost surely, 2^20541533 is an apocalyptic number.

It is an amenable number.

20541533 is a deficient number, since it is larger than the sum of its proper divisors (501055).

20541533 is an equidigital number, since it uses as much as digits as its factorization.

20541533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501054.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 20541533 is about 4532.2768009026. The cubic root of 20541533 is about 273.8698877866.

The spelling of 20541533 in words is "twenty million, five hundred forty-one thousand, five hundred thirty-three".