20795957989 has 2 divisors, whose sum is σ = 20795957990. Its totient is φ = 20795957988.

The previous prime is 20795957983. The next prime is 20795958017. The reversal of 20795957989 is 98975959702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20045745889 + 750212100 = 141583^2 + 27390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20795957989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20795957983) 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, 10397978994 + 10397978995.

It is an arithmetic number, because the mean of its divisors is an integer number (10397978995).

Almost surely, 2^20795957989 is an apocalyptic number.

It is an amenable number.

20795957989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20795957989 is an equidigital number, since it uses as much as digits as its factorization.

20795957989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128595600, while the sum is 70.

The spelling of 20795957989 in words is "twenty billion, seven hundred ninety-five million, nine hundred fifty-seven thousand, nine hundred eighty-nine".