20194830101989 has 2 divisors, whose sum is σ = 20194830101990. Its totient is φ = 20194830101988.

The previous prime is 20194830101987. The next prime is 20194830102043. The reversal of 20194830101989 is 98910103849102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19317413844964 + 877416257025 = 4395158^2 + 936705^2 .

It is a cyclic number.

It is not a de Polignac number, because 20194830101989 - 2¹ = 20194830101987 is a prime.

It is a super-2 number, since 2×20194830101989² (a number of 27 digits) contains 22 as substring.

Together with 20194830101987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20194830101987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10097415050994 + 10097415050995.

It is an arithmetic number, because the mean of its divisors is an integer number (10097415050995).

Almost surely, 2^{20194830101989} is an apocalyptic number.

It is an amenable number.

20194830101989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20194830101989 is an equidigital number, since it uses as much as digits as its factorization.

20194830101989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The spelling of 20194830101989 in words is "twenty trillion, one hundred ninety-four billion, eight hundred thirty million, one hundred one thousand, nine hundred eighty-nine".