20980640363 has 2 divisors, whose sum is σ = 20980640364. Its totient is φ = 20980640362.

The previous prime is 20980640297. The next prime is 20980640407. The reversal of 20980640363 is 36304608902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20980640363 - 2¹⁸ = 20980378219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20980640363.

It is not a weakly prime, because it can be changed into another prime (20980649363) 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, 10490320181 + 10490320182.

It is an arithmetic number, because the mean of its divisors is an integer number (10490320182).

Almost surely, 2^20980640363 is an apocalyptic number.

20980640363 is a deficient number, since it is larger than the sum of its proper divisors (1).

20980640363 is an equidigital number, since it uses as much as digits as its factorization.

20980640363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 20980640363 in words is "twenty billion, nine hundred eighty million, six hundred forty thousand, three hundred sixty-three".