20858328289 has 2 divisors, whose sum is σ = 20858328290. Its totient is φ = 20858328288.

The previous prime is 20858328217. The next prime is 20858328353. The reversal of 20858328289 is 98282385802.

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., 12908822689 + 7949505600 = 113617^2 + 89160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20858328289 is a prime.

It is not a weakly prime, because it can be changed into another prime (20858323289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429164144 + 10429164145.

It is an arithmetic number, because the mean of its divisors is an integer number (10429164145).

Almost surely, 2^20858328289 is an apocalyptic number.

It is an amenable number.

20858328289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858328289 is an equidigital number, since it uses as much as digits as its factorization.

20858328289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4423680, while the sum is 55.

The spelling of 20858328289 in words is "twenty billion, eight hundred fifty-eight million, three hundred twenty-eight thousand, two hundred eighty-nine".