20310005 has 8 divisors (see below), whose sum is σ = 25212600. Its totient is φ = 15687616.

The previous prime is 20310001. The next prime is 20310007. The reversal of 20310005 is 50001302.

It can be written as a sum of positive squares in 4 ways, for example, as 4165681 + 16144324 = 2041^2 + 4018^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20310005 - 2² = 20310001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69890 + ... + 70179.

It is an arithmetic number, because the mean of its divisors is an integer number (3151575).

Almost surely, 2^20310005 is an apocalyptic number.

It is an amenable number.

20310005 is a deficient number, since it is larger than the sum of its proper divisors (4902595).

20310005 is a wasteful number, since it uses less digits than its factorization.

20310005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140103.

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 20310005 is about 4506.6622904318. The cubic root of 20310005 is about 272.8370489222.

Adding to 20310005 its reverse (50001302), we get a palindrome (70311307).

It can be divided in two parts, 20 and 310005, that multiplied together give a square (6200100 = 2490²).

The spelling of 20310005 in words is "twenty million, three hundred ten thousand, five".