20317863 has 8 divisors (see below), whose sum is σ = 27121648. Its totient is φ = 13529664.

The previous prime is 20317853. The next prime is 20317877. The reversal of 20317863 is 36871302.

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

It is not a de Polignac number, because 20317863 - 2⁶ = 20317799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20317863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406 + ... + 6387.

It is an arithmetic number, because the mean of its divisors is an integer number (3390206).

Almost surely, 2^20317863 is an apocalyptic number.

20317863 is a deficient number, since it is larger than the sum of its proper divisors (6803785).

20317863 is an equidigital number, since it uses as much as digits as its factorization.

20317863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7793.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 20317863 is about 4507.5340264939. The cubic root of 20317863 is about 272.8722315344.

It can be divided in two parts, 20317 and 863, that multiplied together give a palindrome (17533571).

The spelling of 20317863 in words is "twenty million, three hundred seventeen thousand, eight hundred sixty-three".