20012999989 has 2 divisors, whose sum is σ = 20012999990. Its totient is φ = 20012999988.

The previous prime is 20012999899. The next prime is 20013000043. The reversal of 20012999989 is 98999921002.

It is a happy number.

Together with previous prime (20012999899) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14032297764 + 5980702225 = 118458^2 + 77335^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012999989 - 2⁹ = 20012999477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012999689) 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, 10006499994 + 10006499995.

It is an arithmetic number, because the mean of its divisors is an integer number (10006499995).

Almost surely, 2^20012999989 is an apocalyptic number.

It is an amenable number.

20012999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012999989 is an equidigital number, since it uses as much as digits as its factorization.

20012999989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1889568, while the sum is 58.

The spelling of 20012999989 in words is "twenty billion, twelve million, nine hundred ninety-nine thousand, nine hundred eighty-nine".