20203351870109 has 2 divisors, whose sum is σ = 20203351870110. Its totient is φ = 20203351870108.

The previous prime is 20203351870063. The next prime is 20203351870223. The reversal of 20203351870109 is 90107815330202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12473823148900 + 7729528721209 = 3531830^2 + 2780203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20203351870109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20203351870309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101675935054 + 10101675935055.

It is an arithmetic number, because the mean of its divisors is an integer number (10101675935055).

Almost surely, 2^{20203351870109} is an apocalyptic number.

It is an amenable number.

20203351870109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203351870109 is an equidigital number, since it uses as much as digits as its factorization.

20203351870109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 20203351870109 in words is "twenty trillion, two hundred three billion, three hundred fifty-one million, eight hundred seventy thousand, one hundred nine".