20091105 has 32 divisors (see below), whose sum is σ = 36558720. Its totient is φ = 10463040.

The previous prime is 20091103. The next prime is 20091119. The reversal of 20091105 is 50119002.

It is not a de Polignac number, because 20091105 - 2¹ = 20091103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20091101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4075 + ... + 7535.

It is an arithmetic number, because the mean of its divisors is an integer number (1142460).

Almost surely, 2^20091105 is an apocalyptic number.

It is an amenable number.

20091105 is a deficient number, since it is larger than the sum of its proper divisors (16467615).

20091105 is a wasteful number, since it uses less digits than its factorization.

20091105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518 (or 3512 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 20091105 is about 4482.3102302273. The cubic root of 20091105 is about 271.8532991002.

The spelling of 20091105 in words is "twenty million, ninety-one thousand, one hundred five".