20342271 has 4 divisors (see below), whose sum is σ = 27123032. Its totient is φ = 13561512.

The previous prime is 20342269. The next prime is 20342303. The reversal of 20342271 is 17224302.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20342271 - 2¹ = 20342269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20342471) 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 3 ways as a sum of consecutive naturals, for example, 3390376 + ... + 3390381.

It is an arithmetic number, because the mean of its divisors is an integer number (6780758).

Almost surely, 2^20342271 is an apocalyptic number.

20342271 is a deficient number, since it is larger than the sum of its proper divisors (6780761).

20342271 is an equidigital number, since it uses as much as digits as its factorization.

20342271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6780760.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20342271 is about 4510.2406809393. The cubic root of 20342271 is about 272.9814556229.

Adding to 20342271 its reverse (17224302), we get a palindrome (37566573).

The spelling of 20342271 in words is "twenty million, three hundred forty-two thousand, two hundred seventy-one".