20171107 has 4 divisors (see below), whose sum is σ = 22004856. Its totient is φ = 18337360.

The previous prime is 20171101. The next prime is 20171147. The reversal of 20171107 is 70117102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20171107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20171101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 916858 + ... + 916879.

It is an arithmetic number, because the mean of its divisors is an integer number (5501214).

Almost surely, 2^20171107 is an apocalyptic number.

20171107 is a deficient number, since it is larger than the sum of its proper divisors (1833749).

20171107 is a wasteful number, since it uses less digits than its factorization.

20171107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833748.

The product of its (nonzero) digits is 98, while the sum is 19.

The square root of 20171107 is about 4491.2255565714. The cubic root of 20171107 is about 272.2136576385.

Adding to 20171107 its reverse (70117102), we get a palindrome (90288209).

The spelling of 20171107 in words is "twenty million, one hundred seventy-one thousand, one hundred seven".