20070208309 has 2 divisors, whose sum is σ = 20070208310. Its totient is φ = 20070208308.

The previous prime is 20070208297. The next prime is 20070208363. The reversal of 20070208309 is 90380207002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19755145809 + 315062500 = 140553^2 + 17750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20070208309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20070208009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10035104154 + 10035104155.

It is an arithmetic number, because the mean of its divisors is an integer number (10035104155).

Almost surely, 2^20070208309 is an apocalyptic number.

It is an amenable number.

20070208309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20070208309 is an equidigital number, since it uses as much as digits as its factorization.

20070208309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 20070208309 in words is "twenty billion, seventy million, two hundred eight thousand, three hundred nine".