20317911 has 8 divisors (see below), whose sum is σ = 27370224. Its totient is φ = 13405440.

The previous prime is 20317903. The next prime is 20317937. The reversal of 20317911 is 11971302.

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

It is not a de Polignac number, because 20317911 - 2³ = 20317903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317981) 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 7 ways as a sum of consecutive naturals, for example, 34620 + ... + 35201.

It is an arithmetic number, because the mean of its divisors is an integer number (3421278).

Almost surely, 2^20317911 is an apocalyptic number.

20317911 is a deficient number, since it is larger than the sum of its proper divisors (7052313).

20317911 is an equidigital number, since it uses as much as digits as its factorization.

20317911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69921.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 20317911 is about 4507.5393509098. The cubic root of 20317911 is about 272.8724464169.

The spelling of 20317911 in words is "twenty million, three hundred seventeen thousand, nine hundred eleven".