20852971 has 2 divisors, whose sum is σ = 20852972. Its totient is φ = 20852970.

The previous prime is 20852947. The next prime is 20852977. The reversal of 20852971 is 17925802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20852971 - 2¹⁵ = 20820203 is a prime.

It is not a weakly prime, because it can be changed into another prime (20852977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10426485 + 10426486.

It is an arithmetic number, because the mean of its divisors is an integer number (10426486).

Almost surely, 2^20852971 is an apocalyptic number.

20852971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20852971 is an equidigital number, since it uses as much as digits as its factorization.

20852971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 20852971 is about 4566.5053377829. The cubic root of 20852971 is about 275.2470331196.

The spelling of 20852971 in words is "twenty million, eight hundred fifty-two thousand, nine hundred seventy-one".