20936109 has 4 divisors (see below), whose sum is σ = 27914816. Its totient is φ = 13957404.

The previous prime is 20936101. The next prime is 20936131. The reversal of 20936109 is 90163902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20936109 - 2³ = 20936101 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 (20936101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3489349 + ... + 3489354.

It is an arithmetic number, because the mean of its divisors is an integer number (6978704).

Almost surely, 2^20936109 is an apocalyptic number.

It is an amenable number.

20936109 is a deficient number, since it is larger than the sum of its proper divisors (6978707).

20936109 is an equidigital number, since it uses as much as digits as its factorization.

20936109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6978706.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 20936109 is about 4575.5993050091. The cubic root of 20936109 is about 275.6123390814.

The spelling of 20936109 in words is "twenty million, nine hundred thirty-six thousand, one hundred nine".