20012011309 has 2 divisors, whose sum is σ = 20012011310. Its totient is φ = 20012011308.

The previous prime is 20012011291. The next prime is 20012011319. The reversal of 20012011309 is 90311021002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19377475209 + 634536100 = 139203^2 + 25190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012011309 - 2⁵ = 20012011277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012011319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006005654 + 10006005655.

It is an arithmetic number, because the mean of its divisors is an integer number (10006005655).

Almost surely, 2^20012011309 is an apocalyptic number.

It is an amenable number.

20012011309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012011309 is an equidigital number, since it uses as much as digits as its factorization.

20012011309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

The spelling of 20012011309 in words is "twenty billion, twelve million, eleven thousand, three hundred nine".