20003351993 has 2 divisors, whose sum is σ = 20003351994. Its totient is φ = 20003351992.

The previous prime is 20003351987. The next prime is 20003352007. The reversal of 20003351993 is 39915330002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14249674384 + 5753677609 = 119372^2 + 75853^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003351993 - 2¹⁸ = 20003089849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20003351923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001675996 + 10001675997.

It is an arithmetic number, because the mean of its divisors is an integer number (10001675997).

Almost surely, 2^20003351993 is an apocalyptic number.

It is an amenable number.

20003351993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003351993 is an equidigital number, since it uses as much as digits as its factorization.

20003351993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21870, while the sum is 35.

Adding to 20003351993 its reverse (39915330002), we get a palindrome (59918681995).

The spelling of 20003351993 in words is "twenty billion, three million, three hundred fifty-one thousand, nine hundred ninety-three".