20203321993 has 2 divisors, whose sum is σ = 20203321994. Its totient is φ = 20203321992.

The previous prime is 20203321981. The next prime is 20203322039. The reversal of 20203321993 is 39912330202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10529222544 + 9674099449 = 102612^2 + 98357^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20203321993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20203321933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101660996 + 10101660997.

It is an arithmetic number, because the mean of its divisors is an integer number (10101660997).

Almost surely, 2^20203321993 is an apocalyptic number.

It is an amenable number.

20203321993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203321993 is an equidigital number, since it uses as much as digits as its factorization.

20203321993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 34.

The spelling of 20203321993 in words is "twenty billion, two hundred three million, three hundred twenty-one thousand, nine hundred ninety-three".