20540111 has 4 divisors (see below), whose sum is σ = 21017832. Its totient is φ = 20062392.

The previous prime is 20540101. The next prime is 20540129. The reversal of 20540111 is 11104502.

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 20540111 - 2²² = 16345807 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 (20540101) 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, 238796 + ... + 238881.

It is an arithmetic number, because the mean of its divisors is an integer number (5254458).

Almost surely, 2^20540111 is an apocalyptic number.

20540111 is a deficient number, since it is larger than the sum of its proper divisors (477721).

20540111 is an equidigital number, since it uses as much as digits as its factorization.

20540111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477720.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 20540111 is about 4532.1199233913. The cubic root of 20540111 is about 273.8635680381.

Adding to 20540111 its reverse (11104502), we get a palindrome (31644613).

The spelling of 20540111 in words is "twenty million, five hundred forty thousand, one hundred eleven".