20940127609 has 2 divisors, whose sum is σ = 20940127610. Its totient is φ = 20940127608.

The previous prime is 20940127531. The next prime is 20940127627. The reversal of 20940127609 is 90672104902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20381845225 + 558282384 = 142765^2 + 23628^2 .

It is a cyclic number.

It is not a de Polignac number, because 20940127609 - 2¹⁷ = 20939996537 is a prime.

It is not a weakly prime, because it can be changed into another prime (20940127309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10470063804 + 10470063805.

It is an arithmetic number, because the mean of its divisors is an integer number (10470063805).

Almost surely, 2^20940127609 is an apocalyptic number.

It is an amenable number.

20940127609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20940127609 is an equidigital number, since it uses as much as digits as its factorization.

20940127609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 20940127609 in words is "twenty billion, nine hundred forty million, one hundred twenty-seven thousand, six hundred nine".