20851407589 has 2 divisors, whose sum is σ = 20851407590. Its totient is φ = 20851407588.

The previous prime is 20851407529. The next prime is 20851407593. The reversal of 20851407589 is 98570415802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20731680225 + 119727364 = 143985^2 + 10942^2 .

It is a cyclic number.

It is not a de Polignac number, because 20851407589 - 2¹⁵ = 20851374821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20851407529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10425703794 + 10425703795.

It is an arithmetic number, because the mean of its divisors is an integer number (10425703795).

Almost surely, 2^20851407589 is an apocalyptic number.

It is an amenable number.

20851407589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20851407589 is an equidigital number, since it uses as much as digits as its factorization.

20851407589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806400, while the sum is 49.

The spelling of 20851407589 in words is "twenty billion, eight hundred fifty-one million, four hundred seven thousand, five hundred eighty-nine".