20720316361 has 2 divisors, whose sum is σ = 20720316362. Its totient is φ = 20720316360.

The previous prime is 20720316307. The next prime is 20720316403. The reversal of 20720316361 is 16361302702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10641160336 + 10079156025 = 103156^2 + 100395^2 .

It is a cyclic number.

It is not a de Polignac number, because 20720316361 - 2⁷ = 20720316233 is a prime.

It is not a weakly prime, because it can be changed into another prime (20720316961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10360158180 + 10360158181.

It is an arithmetic number, because the mean of its divisors is an integer number (10360158181).

Almost surely, 2^20720316361 is an apocalyptic number.

It is an amenable number.

20720316361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20720316361 is an equidigital number, since it uses as much as digits as its factorization.

20720316361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The spelling of 20720316361 in words is "twenty billion, seven hundred twenty million, three hundred sixteen thousand, three hundred sixty-one".