20405119788409 has 2 divisors, whose sum is σ = 20405119788410. Its totient is φ = 20405119788408.

The previous prime is 20405119788343. The next prime is 20405119788437. The reversal of 20405119788409 is 90488791150402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20090878821225 + 314240967184 = 4482285^2 + 560572^2 .

It is a cyclic number.

It is not a de Polignac number, because 20405119788409 - 2¹⁵ = 20405119755641 is a prime.

It is not a weakly prime, because it can be changed into another prime (20405119788479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202559894204 + 10202559894205.

It is an arithmetic number, because the mean of its divisors is an integer number (10202559894205).

Almost surely, 2^{20405119788409} is an apocalyptic number.

It is an amenable number.

20405119788409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20405119788409 is an equidigital number, since it uses as much as digits as its factorization.

20405119788409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 58.

The spelling of 20405119788409 in words is "twenty trillion, four hundred five billion, one hundred nineteen million, seven hundred eighty-eight thousand, four hundred nine".