20315326609 has 2 divisors, whose sum is σ = 20315326610. Its totient is φ = 20315326608.

The previous prime is 20315326561. The next prime is 20315326663. The reversal of 20315326609 is 90662351302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19894256209 + 421070400 = 141047^2 + 20520^2 .

It is a cyclic number.

It is not a de Polignac number, because 20315326609 - 2¹³ = 20315318417 is a prime.

It is not a weakly prime, because it can be changed into another prime (20315326309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157663304 + 10157663305.

It is an arithmetic number, because the mean of its divisors is an integer number (10157663305).

Almost surely, 2^20315326609 is an apocalyptic number.

It is an amenable number.

20315326609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20315326609 is an equidigital number, since it uses as much as digits as its factorization.

20315326609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 37.

The spelling of 20315326609 in words is "twenty billion, three hundred fifteen million, three hundred twenty-six thousand, six hundred nine".