20317749 has 8 divisors (see below), whose sum is σ = 27128640. Its totient is φ = 13526016.

The previous prime is 20317727. The next prime is 20317751. The reversal of 20317749 is 94771302.

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

It is not a de Polignac number, because 20317749 - 2¹² = 20313653 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20317799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2097 + ... + 6710.

It is an arithmetic number, because the mean of its divisors is an integer number (3391080).

Almost surely, 2^20317749 is an apocalyptic number.

It is an amenable number.

20317749 is a deficient number, since it is larger than the sum of its proper divisors (6810891).

20317749 is an equidigital number, since it uses as much as digits as its factorization.

20317749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9579.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 20317749 is about 4507.5213809809. The cubic root of 20317749 is about 272.8717211873.

The spelling of 20317749 in words is "twenty million, three hundred seventeen thousand, seven hundred forty-nine".