20203351870309 has 2 divisors, whose sum is σ = 20203351870310. Its totient is φ = 20203351870308.

The previous prime is 20203351870267. The next prime is 20203351870321. The reversal of 20203351870309 is 90307815330202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18910930768900 + 1292421101409 = 4348670^2 + 1136847^2 .

It is a cyclic number.

It is not a de Polignac number, because 20203351870309 - 2³⁹ = 19653596056421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20203351870379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101675935154 + 10101675935155.

It is an arithmetic number, because the mean of its divisors is an integer number (10101675935155).

Almost surely, 2^{20203351870309} is an apocalyptic number.

It is an amenable number.

20203351870309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203351870309 is an equidigital number, since it uses as much as digits as its factorization.

20203351870309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 20203351870309 in words is "twenty trillion, two hundred three billion, three hundred fifty-one million, eight hundred seventy thousand, three hundred nine".