20945783983 has 2 divisors, whose sum is σ = 20945783984. Its totient is φ = 20945783982.

The previous prime is 20945783921. The next prime is 20945784001. The reversal of 20945783983 is 38938754902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20945783983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20945703983) 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, 10472891991 + 10472891992.

It is an arithmetic number, because the mean of its divisors is an integer number (10472891992).

Almost surely, 2^20945783983 is an apocalyptic number.

20945783983 is a deficient number, since it is larger than the sum of its proper divisors (1).

20945783983 is an equidigital number, since it uses as much as digits as its factorization.

20945783983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13063680, while the sum is 58.

The spelling of 20945783983 in words is "twenty billion, nine hundred forty-five million, seven hundred eighty-three thousand, nine hundred eighty-three".