20540317 has 8 divisors (see below), whose sum is σ = 23507712. Its totient is φ = 17581200.

The previous prime is 20540293. The next prime is 20540329. The reversal of 20540317 is 71304502.

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

It is not a de Polignac number, because 20540317 - 2¹⁵ = 20507549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540017) 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, 4767 + ... + 7987.

It is an arithmetic number, because the mean of its divisors is an integer number (2938464).

Almost surely, 2^20540317 is an apocalyptic number.

It is an amenable number.

20540317 is a deficient number, since it is larger than the sum of its proper divisors (2967395).

20540317 is an equidigital number, since it uses as much as digits as its factorization.

20540317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20540317 is about 4532.1426500056. The cubic root of 20540317 is about 273.8644835753.

Adding to 20540317 its reverse (71304502), we get a palindrome (91844819).

The spelling of 20540317 in words is "twenty million, five hundred forty thousand, three hundred seventeen".