20109005 has 8 divisors (see below), whose sum is σ = 27578112. Its totient is φ = 13789008.

The previous prime is 20108989. The next prime is 20109007. The reversal of 20109005 is 50090102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20109005 - 2⁴ = 20108989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20109007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287237 + ... + 287306.

It is an arithmetic number, because the mean of its divisors is an integer number (3447264).

Almost surely, 2^20109005 is an apocalyptic number.

It is an amenable number.

20109005 is a deficient number, since it is larger than the sum of its proper divisors (7469107).

20109005 is an equidigital number, since it uses as much as digits as its factorization.

20109005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574555.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 20109005 is about 4484.3065238674. The cubic root of 20109005 is about 271.9340102675.

Adding to 20109005 its reverse (50090102), we get a palindrome (70199107).

The spelling of 20109005 in words is "twenty million, one hundred nine thousand, five".