20317611 has 4 divisors (see below), whose sum is σ = 27090152. Its totient is φ = 13545072.

The previous prime is 20317597. The next prime is 20317613. The reversal of 20317611 is 11671302.

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

It is not a de Polignac number, because 20317611 - 2¹⁰ = 20316587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20317613) 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, 3386266 + ... + 3386271.

It is an arithmetic number, because the mean of its divisors is an integer number (6772538).

Almost surely, 2^20317611 is an apocalyptic number.

20317611 is a deficient number, since it is larger than the sum of its proper divisors (6772541).

20317611 is an equidigital number, since it uses as much as digits as its factorization.

20317611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6772540.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 20317611 is about 4507.5060732072. The cubic root of 20317611 is about 272.8711033960.

Adding to 20317611 its reverse (11671302), we get a palindrome (31988913).

The spelling of 20317611 in words is "twenty million, three hundred seventeen thousand, six hundred eleven".