20323917 has 6 divisors (see below), whose sum is σ = 29356782. Its totient is φ = 13549272.

The previous prime is 20323913. The next prime is 20323921. The reversal of 20323917 is 71932302.

It is an interprime number because it is at equal distance from previous prime (20323913) and next prime (20323921).

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 19881 = 4506^2 + 141^2 .

It is not a de Polignac number, because 20323917 - 2² = 20323913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323913) 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 5 ways as a sum of consecutive naturals, for example, 1129098 + ... + 1129115.

It is an arithmetic number, because the mean of its divisors is an integer number (4892797).

Almost surely, 2^20323917 is an apocalyptic number.

It is an amenable number.

20323917 is a deficient number, since it is larger than the sum of its proper divisors (9032865).

20323917 is a wasteful number, since it uses less digits than its factorization.

20323917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258219 (or 2258216 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 20323917 is about 4508.2055188290. The cubic root of 20323917 is about 272.8993309139.

The spelling of 20323917 in words is "twenty million, three hundred twenty-three thousand, nine hundred seventeen".