20974171 has 2 divisors, whose sum is σ = 20974172. Its totient is φ = 20974170.

The previous prime is 20974169. The next prime is 20974189. The reversal of 20974171 is 17147902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20974171 - 2¹ = 20974169 is a prime.

Together with 20974169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20974111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10487085 + 10487086.

It is an arithmetic number, because the mean of its divisors is an integer number (10487086).

Almost surely, 2^20974171 is an apocalyptic number.

20974171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20974171 is an equidigital number, since it uses as much as digits as its factorization.

20974171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 20974171 is about 4579.7566529238. The cubic root of 20974171 is about 275.7792597205.

The spelling of 20974171 in words is "twenty million, nine hundred seventy-four thousand, one hundred seventy-one".