20342305 has 16 divisors (see below), whose sum is σ = 25194240. Its totient is φ = 15759232.

The previous prime is 20342303. The next prime is 20342317. The reversal of 20342305 is 50324302.

It is a cyclic number.

It is not a de Polignac number, because 20342305 - 2¹ = 20342303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20342303) 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 15 ways as a sum of consecutive naturals, for example, 24741 + ... + 25549.

It is an arithmetic number, because the mean of its divisors is an integer number (1574640).

Almost surely, 2^20342305 is an apocalyptic number.

It is an amenable number.

20342305 is a deficient number, since it is larger than the sum of its proper divisors (4851935).

20342305 is a wasteful number, since it uses less digits than its factorization.

20342305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 20342305 is about 4510.2444501379. The cubic root of 20342305 is about 272.9816077096.

Adding to 20342305 its reverse (50324302), we get a palindrome (70666607).

The spelling of 20342305 in words is "twenty million, three hundred forty-two thousand, three hundred five".