20847163 has 2 divisors, whose sum is σ = 20847164. Its totient is φ = 20847162.

The previous prime is 20847149. The next prime is 20847173. The reversal of 20847163 is 36174802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20847163 - 2¹³ = 20838971 is a prime.

It is equal to p_1320898 and since 20847163 and 1320898 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 (20847133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10423581 + 10423582.

It is an arithmetic number, because the mean of its divisors is an integer number (10423582).

Almost surely, 2^20847163 is an apocalyptic number.

20847163 is a deficient number, since it is larger than the sum of its proper divisors (1).

20847163 is an equidigital number, since it uses as much as digits as its factorization.

20847163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 20847163 is about 4565.8693586216. The cubic root of 20847163 is about 275.2214766779.

The spelling of 20847163 in words is "twenty million, eight hundred forty-seven thousand, one hundred sixty-three".