30020019989 has 2 divisors, whose sum is σ = 30020019990. Its totient is φ = 30020019988.

The previous prime is 30020019983. The next prime is 30020020001. The reversal of 30020019989 is 98991002003.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20053392100 + 9966627889 = 141610^2 + 99833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30020019989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30020019983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15010009994 + 15010009995.

It is an arithmetic number, because the mean of its divisors is an integer number (15010009995).

Almost surely, 2^30020019989 is an apocalyptic number.

It is an amenable number.

30020019989 is a deficient number, since it is larger than the sum of its proper divisors (1).

30020019989 is an equidigital number, since it uses as much as digits as its factorization.

30020019989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 30020019989 in words is "thirty billion, twenty million, nineteen thousand, nine hundred eighty-nine".