20009999993 has 2 divisors, whose sum is σ = 20009999994. Its totient is φ = 20009999992.

The previous prime is 20009999983. The next prime is 20010000011. The reversal of 20009999993 is 39999990002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19709913664 + 300086329 = 140392^2 + 17323^2 .

It is a cyclic number.

It is not a de Polignac number, because 20009999993 - 2¹² = 20009995897 is a prime.

It is not a weakly prime, because it can be changed into another prime (20009999963) 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, 10004999996 + 10004999997.

It is an arithmetic number, because the mean of its divisors is an integer number (10004999997).

Almost surely, 2^20009999993 is an apocalyptic number.

It is an amenable number.

20009999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20009999993 is an equidigital number, since it uses as much as digits as its factorization.

20009999993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3188646, while the sum is 59.

The spelling of 20009999993 in words is "twenty billion, nine million, nine hundred ninety-nine thousand, nine hundred ninety-three".