20904167 has 2 divisors, whose sum is σ = 20904168. Its totient is φ = 20904166.

The previous prime is 20904119. The next prime is 20904173. The reversal of 20904167 is 76140902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20904167 - 2¹⁰ = 20903143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20907167) 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, 10452083 + 10452084.

It is an arithmetic number, because the mean of its divisors is an integer number (10452084).

Almost surely, 2^20904167 is an apocalyptic number.

20904167 is a deficient number, since it is larger than the sum of its proper divisors (1).

20904167 is an equidigital number, since it uses as much as digits as its factorization.

20904167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20904167 is about 4572.1075009234. The cubic root of 20904167 is about 275.4721014609.

The spelling of 20904167 in words is "twenty million, nine hundred four thousand, one hundred sixty-seven".