20852471 has 2 divisors, whose sum is σ = 20852472. Its totient is φ = 20852470.

The previous prime is 20852441. The next prime is 20852473. The reversal of 20852471 is 17425802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20852471 - 2⁶ = 20852407 is a prime.

It is a super-3 number, since 3×20852471³ (a number of 23 digits) contains 333 as substring.

Together with 20852473, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20852473) 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 as a sum of consecutive naturals, namely, 10426235 + 10426236.

It is an arithmetic number, because the mean of its divisors is an integer number (10426236).

Almost surely, 2^20852471 is an apocalyptic number.

20852471 is a deficient number, since it is larger than the sum of its proper divisors (1).

20852471 is an equidigital number, since it uses as much as digits as its factorization.

20852471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 20852471 is about 4566.4505909952. The cubic root of 20852471 is about 275.2448331994.

The spelling of 20852471 in words is "twenty million, eight hundred fifty-two thousand, four hundred seventy-one".