20481871 has 2 divisors, whose sum is σ = 20481872. Its totient is φ = 20481870.

The previous prime is 20481823. The next prime is 20481887. The reversal of 20481871 is 17818402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20481871 - 2¹⁵ = 20449103 is a prime.

It is equal to p_1299172 and since 20481871 and 1299172 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20481271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10240935 + 10240936.

It is an arithmetic number, because the mean of its divisors is an integer number (10240936).

Almost surely, 2^20481871 is an apocalyptic number.

20481871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20481871 is an equidigital number, since it uses as much as digits as its factorization.

20481871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 20481871 is about 4525.6901131209. The cubic root of 20481871 is about 273.6044828942.

The spelling of 20481871 in words is "twenty million, four hundred eighty-one thousand, eight hundred seventy-one".