20408910379129 has 2 divisors, whose sum is σ = 20408910379130. Its totient is φ = 20408910379128.

The previous prime is 20408910379073. The next prime is 20408910379139. The reversal of 20408910379129 is 92197301980402.

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., 19663442185104 + 745468194025 = 4434348^2 + 863405^2 .

It is a cyclic number.

It is not a de Polignac number, because 20408910379129 - 2⁹ = 20408910378617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20408910379129.

It is not a weakly prime, because it can be changed into another prime (20408910379139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10204455189564 + 10204455189565.

It is an arithmetic number, because the mean of its divisors is an integer number (10204455189565).

Almost surely, 2^{20408910379129} is an apocalyptic number.

It is an amenable number.

20408910379129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20408910379129 is an equidigital number, since it uses as much as digits as its factorization.

20408910379129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 20408910379129 in words is "twenty trillion, four hundred eight billion, nine hundred ten million, three hundred seventy-nine thousand, one hundred twenty-nine".