20318971 has 2 divisors, whose sum is σ = 20318972. Its totient is φ = 20318970.

The previous prime is 20318953. The next prime is 20318989. The reversal of 20318971 is 17981302.

It is a balanced prime because it is at equal distance from previous prime (20318953) and next prime (20318989).

It is a cyclic number.

It is not a de Polignac number, because 20318971 - 2⁵ = 20318939 is a prime.

It is a Chen prime.

It is equal to p_1289560 and since 20318971 and 1289560 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20318911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10159485 + 10159486.

It is an arithmetic number, because the mean of its divisors is an integer number (10159486).

Almost surely, 2^20318971 is an apocalyptic number.

20318971 is a deficient number, since it is larger than the sum of its proper divisors (1).

20318971 is an equidigital number, since it uses as much as digits as its factorization.

20318971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 20318971 is about 4507.6569301578. The cubic root of 20318971 is about 272.8771916515.

The spelling of 20318971 in words is "twenty million, three hundred eighteen thousand, nine hundred seventy-one".