20200340261 has 2 divisors, whose sum is σ = 20200340262. Its totient is φ = 20200340260.

The previous prime is 20200340213. The next prime is 20200340263. The reversal of 20200340261 is 16204300202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20194115236 + 6225025 = 142106^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200340261 - 2³⁰ = 19126598437 is a prime.

Together with 20200340263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20200340263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100170130 + 10100170131.

It is an arithmetic number, because the mean of its divisors is an integer number (10100170131).

Almost surely, 2^20200340261 is an apocalyptic number.

It is an amenable number.

20200340261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200340261 is an equidigital number, since it uses as much as digits as its factorization.

20200340261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20200340261 its reverse (16204300202), we get a palindrome (36404640463).

The spelling of 20200340261 in words is "twenty billion, two hundred million, three hundred forty thousand, two hundred sixty-one".