20658224321989 has 2 divisors, whose sum is σ = 20658224321990. Its totient is φ = 20658224321988.

The previous prime is 20658224321971. The next prime is 20658224322019. The reversal of 20658224321989 is 98912342285602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15139554157764 + 5518670164225 = 3890958^2 + 2349185^2 .

It is a cyclic number.

It is not a de Polignac number, because 20658224321989 - 2¹⁷ = 20658224190917 is a prime.

It is a super-2 number, since 2×20658224321989² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20658224321939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10329112160994 + 10329112160995.

It is an arithmetic number, because the mean of its divisors is an integer number (10329112160995).

Almost surely, 2^{20658224321989} is an apocalyptic number.

It is an amenable number.

20658224321989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20658224321989 is an equidigital number, since it uses as much as digits as its factorization.

20658224321989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29859840, while the sum is 61.

The spelling of 20658224321989 in words is "twenty trillion, six hundred fifty-eight billion, two hundred twenty-four million, three hundred twenty-one thousand, nine hundred eighty-nine".