20383721843 has 2 divisors, whose sum is σ = 20383721844. Its totient is φ = 20383721842.

The previous prime is 20383721819. The next prime is 20383721851. The reversal of 20383721843 is 34812738302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20383721843 - 2⁸ = 20383721587 is a prime.

It is a super-2 number, since 2×20383721843² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20383721843.

It is not a weakly prime, because it can be changed into another prime (20383729843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10191860921 + 10191860922.

It is an arithmetic number, because the mean of its divisors is an integer number (10191860922).

Almost surely, 2^20383721843 is an apocalyptic number.

20383721843 is a deficient number, since it is larger than the sum of its proper divisors (1).

20383721843 is an equidigital number, since it uses as much as digits as its factorization.

20383721843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 20383721843 in words is "twenty billion, three hundred eighty-three million, seven hundred twenty-one thousand, eight hundred forty-three".