20000001689 has 2 divisors, whose sum is σ = 20000001690. Its totient is φ = 20000001688.

The previous prime is 20000001677. The next prime is 20000001701. The reversal of 20000001689 is 98610000002.

It is a balanced prime because it is at equal distance from previous prime (20000001677) and next prime (20000001701).

It can be written as a sum of positive squares in only one way, i.e., 19398918400 + 601083289 = 139280^2 + 24517^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20000001689 is a prime.

It is not a weakly prime, because it can be changed into another prime (20000007689) 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, 10000000844 + 10000000845.

It is an arithmetic number, because the mean of its divisors is an integer number (10000000845).

Almost surely, 2^20000001689 is an apocalyptic number.

It is an amenable number.

20000001689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000001689 is an equidigital number, since it uses as much as digits as its factorization.

20000001689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 20000001689 in words is "twenty billion, one thousand, six hundred eighty-nine".