20434604209 has 2 divisors, whose sum is σ = 20434604210. Its totient is φ = 20434604208.

The previous prime is 20434604161. The next prime is 20434604261. The reversal of 20434604209 is 90240643402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19644825600 + 789778609 = 140160^2 + 28103^2 .

It is a cyclic number.

It is not a de Polignac number, because 20434604209 - 2¹⁹ = 20434079921 is a prime.

It is not a weakly prime, because it can be changed into another prime (20434604269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217302104 + 10217302105.

It is an arithmetic number, because the mean of its divisors is an integer number (10217302105).

Almost surely, 2^20434604209 is an apocalyptic number.

It is an amenable number.

20434604209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434604209 is an equidigital number, since it uses as much as digits as its factorization.

20434604209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 20434604209 in words is "twenty billion, four hundred thirty-four million, six hundred four thousand, two hundred nine".