20471271 has 4 divisors (see below), whose sum is σ = 27295032. Its totient is φ = 13647512.

The previous prime is 20471267. The next prime is 20471279. The reversal of 20471271 is 17217402.

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

It is a cyclic number.

It is not a de Polignac number, because 20471271 - 2² = 20471267 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20471279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3411876 + ... + 3411881.

It is an arithmetic number, because the mean of its divisors is an integer number (6823758).

Almost surely, 2^20471271 is an apocalyptic number.

20471271 is a deficient number, since it is larger than the sum of its proper divisors (6823761).

20471271 is an equidigital number, since it uses as much as digits as its factorization.

20471271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6823760.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 20471271 is about 4524.5188694490. The cubic root of 20471271 is about 273.5572751631.

Adding to 20471271 its reverse (17217402), we get a palindrome (37688673).

The spelling of 20471271 in words is "twenty million, four hundred seventy-one thousand, two hundred seventy-one".