20854147 has 2 divisors, whose sum is σ = 20854148. Its totient is φ = 20854146.

The previous prime is 20854139. The next prime is 20854159. The reversal of 20854147 is 74145802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20854147 - 2³ = 20854139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20854447) 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, 10427073 + 10427074.

It is an arithmetic number, because the mean of its divisors is an integer number (10427074).

Almost surely, 2^20854147 is an apocalyptic number.

20854147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20854147 is an equidigital number, since it uses as much as digits as its factorization.

20854147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 20854147 is about 4566.6340996406. The cubic root of 20854147 is about 275.2522071933.

Adding to 20854147 its reverse (74145802), we get a palindrome (94999949).

The spelling of 20854147 in words is "twenty million, eight hundred fifty-four thousand, one hundred forty-seven".