20456317 has 4 divisors (see below), whose sum is σ = 23378656. Its totient is φ = 17533980.

The previous prime is 20456309. The next prime is 20456323. The reversal of 20456317 is 71365402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20456317 - 2³ = 20456309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20456617) 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, 1461159 + ... + 1461172.

It is an arithmetic number, because the mean of its divisors is an integer number (5844664).

Almost surely, 2^20456317 is an apocalyptic number.

It is an amenable number.

20456317 is a deficient number, since it is larger than the sum of its proper divisors (2922339).

20456317 is an equidigital number, since it uses as much as digits as its factorization.

20456317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922338.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 20456317 is about 4522.8660161451. The cubic root of 20456317 is about 273.4906489143.

The spelling of 20456317 in words is "twenty million, four hundred fifty-six thousand, three hundred seventeen".