20144869 has 2 divisors, whose sum is σ = 20144870. Its totient is φ = 20144868.

The previous prime is 20144857. The next prime is 20144903. The reversal of 20144869 is 96844102.

It is an a-pointer prime, because the next prime (20144903) can be obtained adding 20144869 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10304100 + 9840769 = 3210^2 + 3137^2 .

It is a cyclic number.

It is not a de Polignac number, because 20144869 - 2⁵ = 20144837 is a prime.

It is a super-2 number, since 2×20144869² = 811631494054322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20144809) 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, 10072434 + 10072435.

It is an arithmetic number, because the mean of its divisors is an integer number (10072435).

Almost surely, 2^20144869 is an apocalyptic number.

It is an amenable number.

20144869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20144869 is an equidigital number, since it uses as much as digits as its factorization.

20144869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20144869 is about 4488.3035770768. The cubic root of 20144869 is about 272.0955771742.

The spelling of 20144869 in words is "twenty million, one hundred forty-four thousand, eight hundred sixty-nine".