20671471 has 2 divisors, whose sum is σ = 20671472. Its totient is φ = 20671470.

The previous prime is 20671423. The next prime is 20671477. The reversal of 20671471 is 17417602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20671471 - 2⁹ = 20670959 is a prime.

It is a super-3 number, since 3×20671471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20671477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10335735 + 10335736.

It is an arithmetic number, because the mean of its divisors is an integer number (10335736).

Almost surely, 2^20671471 is an apocalyptic number.

20671471 is a deficient number, since it is larger than the sum of its proper divisors (1).

20671471 is an equidigital number, since it uses as much as digits as its factorization.

20671471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20671471 is about 4546.5889411734. The cubic root of 20671471 is about 274.4461403525.

The spelling of 20671471 in words is "twenty million, six hundred seventy-one thousand, four hundred seventy-one".