20435012617 has 2 divisors, whose sum is σ = 20435012618. Its totient is φ = 20435012616.

The previous prime is 20435012599. The next prime is 20435012621. The reversal of 20435012617 is 71621053402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20410122496 + 24890121 = 142864^2 + 4989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20435012617 - 2⁷ = 20435012489 is a prime.

It is not a weakly prime, because it can be changed into another prime (20435012657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217506308 + 10217506309.

It is an arithmetic number, because the mean of its divisors is an integer number (10217506309).

Almost surely, 2^20435012617 is an apocalyptic number.

It is an amenable number.

20435012617 is a deficient number, since it is larger than the sum of its proper divisors (1).

20435012617 is an equidigital number, since it uses as much as digits as its factorization.

20435012617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 20435012617 in words is "twenty billion, four hundred thirty-five million, twelve thousand, six hundred seventeen".