20541439 has 4 divisors (see below), whose sum is σ = 20595456. Its totient is φ = 20487424.

The previous prime is 20541431. The next prime is 20541449. The reversal of 20541439 is 93414502.

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

It is a cyclic number.

It is not a de Polignac number, because 20541439 - 2³ = 20541431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26434 + ... + 27199.

It is an arithmetic number, because the mean of its divisors is an integer number (5148864).

Almost surely, 2^20541439 is an apocalyptic number.

20541439 is a deficient number, since it is larger than the sum of its proper divisors (54017).

20541439 is an equidigital number, since it uses as much as digits as its factorization.

20541439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54016.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20541439 is about 4532.2664308269. The cubic root of 20541439 is about 273.8694700345.

The spelling of 20541439 in words is "twenty million, five hundred forty-one thousand, four hundred thirty-nine".