20109535 has 4 divisors (see below), whose sum is σ = 24131448. Its totient is φ = 16087624.

The previous prime is 20109517. The next prime is 20109539. The reversal of 20109535 is 53590102.

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 20109535 - 2⁵ = 20109503 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 (20109539) 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, 2010949 + ... + 2010958.

It is an arithmetic number, because the mean of its divisors is an integer number (6032862).

Almost surely, 2^20109535 is an apocalyptic number.

20109535 is a deficient number, since it is larger than the sum of its proper divisors (4021913).

20109535 is an equidigital number, since it uses as much as digits as its factorization.

20109535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4021912.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 20109535 is about 4484.3656184571. The cubic root of 20109535 is about 271.9363993093.

Adding to 20109535 its reverse (53590102), we get a palindrome (73699637).

The spelling of 20109535 in words is "twenty million, one hundred nine thousand, five hundred thirty-five".