20313617 has 4 divisors (see below), whose sum is σ = 20450100. Its totient is φ = 20177136.

The previous prime is 20313611. The next prime is 20313619. The reversal of 20313617 is 71631302.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1164241 + 19149376 = 1079^2 + 4376^2 .

It is a cyclic number.

It is not a de Polignac number, because 20313617 - 2⁸ = 20313361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20313592 and 20313601.

It is not an unprimeable number, because it can be changed into a prime (20313611) 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, 68018 + ... + 68315.

It is an arithmetic number, because the mean of its divisors is an integer number (5112525).

Almost surely, 2^20313617 is an apocalyptic number.

It is an amenable number.

20313617 is a deficient number, since it is larger than the sum of its proper divisors (136483).

20313617 is a wasteful number, since it uses less digits than its factorization.

20313617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136482.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 20313617 is about 4507.0630126503. The cubic root of 20313617 is about 272.8532220515.

Adding to 20313617 its reverse (71631302), we get a palindrome (91944919).

The spelling of 20313617 in words is "twenty million, three hundred thirteen thousand, six hundred seventeen".