20171117 has 4 divisors (see below), whose sum is σ = 20180160. Its totient is φ = 20162076.

The previous prime is 20171101. The next prime is 20171147. The reversal of 20171117 is 71117102.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20171117 - 2⁴ = 20171101 is a prime.

It is a super-2 number, since 2×20171117² = 813747922055378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20171147) 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, 1484 + ... + 6522.

It is an arithmetic number, because the mean of its divisors is an integer number (5045040).

Almost surely, 2^20171117 is an apocalyptic number.

It is an amenable number.

20171117 is a deficient number, since it is larger than the sum of its proper divisors (9043).

20171117 is an equidigital number, since it uses as much as digits as its factorization.

20171117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9042.

The product of its (nonzero) digits is 98, while the sum is 20.

The square root of 20171117 is about 4491.2266698531. The cubic root of 20171117 is about 272.2137026226.

Adding to 20171117 its reverse (71117102), we get a palindrome (91288219).

The spelling of 20171117 in words is "twenty million, one hundred seventy-one thousand, one hundred seventeen".