20450104309 has 2 divisors, whose sum is σ = 20450104310. Its totient is φ = 20450104308.

The previous prime is 20450104307. The next prime is 20450104331. The reversal of 20450104309 is 90340105402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20421267409 + 28836900 = 142903^2 + 5370^2 .

It is a cyclic number.

It is not a de Polignac number, because 20450104309 - 2¹ = 20450104307 is a prime.

Together with 20450104307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20450104307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10225052154 + 10225052155.

It is an arithmetic number, because the mean of its divisors is an integer number (10225052155).

Almost surely, 2^20450104309 is an apocalyptic number.

It is an amenable number.

20450104309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20450104309 is an equidigital number, since it uses as much as digits as its factorization.

20450104309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 20450104309 in words is "twenty billion, four hundred fifty million, one hundred four thousand, three hundred nine".