20411869 has 2 divisors, whose sum is σ = 20411870. Its totient is φ = 20411868.

The previous prime is 20411843. The next prime is 20411887. The reversal of 20411869 is 96811402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11471769 + 8940100 = 3387^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 20411869 - 2⁹ = 20411357 is a prime.

It is a super-2 number, since 2×20411869² = 833288792146322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20411869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20411899) 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, 10205934 + 10205935.

It is an arithmetic number, because the mean of its divisors is an integer number (10205935).

Almost surely, 2^20411869 is an apocalyptic number.

It is an amenable number.

20411869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20411869 is an equidigital number, since it uses as much as digits as its factorization.

20411869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 20411869 is about 4517.9496455804. The cubic root of 20411869 is about 273.2924228215.

The spelling of 20411869 in words is "twenty million, four hundred eleven thousand, eight hundred sixty-nine".