20310109993 has 2 divisors, whose sum is σ = 20310109994. Its totient is φ = 20310109992.

The previous prime is 20310109979. The next prime is 20310110077. The reversal of 20310109993 is 39990101302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13316467609 + 6993642384 = 115397^2 + 83628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20310109993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20310109943) 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, 10155054996 + 10155054997.

It is an arithmetic number, because the mean of its divisors is an integer number (10155054997).

Almost surely, 2^20310109993 is an apocalyptic number.

It is an amenable number.

20310109993 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310109993 is an equidigital number, since it uses as much as digits as its factorization.

20310109993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 37.

The spelling of 20310109993 in words is "twenty billion, three hundred ten million, one hundred nine thousand, nine hundred ninety-three".