20613422209 has 2 divisors, whose sum is σ = 20613422210. Its totient is φ = 20613422208.

The previous prime is 20613422191. The next prime is 20613422251. The reversal of 20613422209 is 90222431602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19698964609 + 914457600 = 140353^2 + 30240^2 .

It is a cyclic number.

It is not a de Polignac number, because 20613422209 - 2²³ = 20605033601 is a prime.

It is not a weakly prime, because it can be changed into another prime (20613492209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306711104 + 10306711105.

It is an arithmetic number, because the mean of its divisors is an integer number (10306711105).

Almost surely, 2^20613422209 is an apocalyptic number.

It is an amenable number.

20613422209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20613422209 is an equidigital number, since it uses as much as digits as its factorization.

20613422209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 20613422209 in words is "twenty billion, six hundred thirteen million, four hundred twenty-two thousand, two hundred nine".