20144857 has 2 divisors, whose sum is σ = 20144858. Its totient is φ = 20144856.

The previous prime is 20144837. The next prime is 20144869. The reversal of 20144857 is 75844102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11758041 + 8386816 = 3429^2 + 2896^2 .

It is a cyclic number.

It is not a de Polignac number, because 20144857 - 2¹⁹ = 19620569 is a prime.

It is not a weakly prime, because it can be changed into another prime (20144837) 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, 10072428 + 10072429.

It is an arithmetic number, because the mean of its divisors is an integer number (10072429).

Almost surely, 2^20144857 is an apocalyptic number.

It is an amenable number.

20144857 is a deficient number, since it is larger than the sum of its proper divisors (1).

20144857 is an equidigital number, since it uses as much as digits as its factorization.

20144857 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 20144857 is about 4488.3022402686. The cubic root of 20144857 is about 272.0955231464.

Adding to 20144857 its reverse (75844102), we get a palindrome (95988959).

The spelling of 20144857 in words is "twenty million, one hundred forty-four thousand, eight hundred fifty-seven".