20011010989 has 2 divisors, whose sum is σ = 20011010990. Its totient is φ = 20011010988.

The previous prime is 20011010983. The next prime is 20011011001. The reversal of 20011010989 is 98901011002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16177296100 + 3833714889 = 127190^2 + 61917^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011010989 - 2²⁵ = 19977456557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011010989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011010983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005505494 + 10005505495.

It is an arithmetic number, because the mean of its divisors is an integer number (10005505495).

Almost surely, 2^20011010989 is an apocalyptic number.

It is an amenable number.

20011010989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011010989 is an equidigital number, since it uses as much as digits as its factorization.

20011010989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 20011010989 in words is "twenty billion, eleven million, ten thousand, nine hundred eighty-nine".