20009669689 has 2 divisors, whose sum is σ = 20009669690. Its totient is φ = 20009669688.

The previous prime is 20009669677. The next prime is 20009669717. The reversal of 20009669689 is 98696690002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18063360000 + 1946309689 = 134400^2 + 44117^2 .

It is a cyclic number.

It is not a de Polignac number, because 20009669689 - 2⁵ = 20009669657 is a prime.

It is not a weakly prime, because it can be changed into another prime (20009669189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004834844 + 10004834845.

It is an arithmetic number, because the mean of its divisors is an integer number (10004834845).

Almost surely, 2^20009669689 is an apocalyptic number.

It is an amenable number.

20009669689 is a deficient number, since it is larger than the sum of its proper divisors (1).

20009669689 is an equidigital number, since it uses as much as digits as its factorization.

20009669689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The spelling of 20009669689 in words is "twenty billion, nine million, six hundred sixty-nine thousand, six hundred eighty-nine".