20533232989 has 2 divisors, whose sum is σ = 20533232990. Its totient is φ = 20533232988.

The previous prime is 20533232983. The next prime is 20533233011. The reversal of 20533232989 is 98923233502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17543002500 + 2990230489 = 132450^2 + 54683^2 .

It is a cyclic number.

It is not a de Polignac number, because 20533232989 - 2⁹ = 20533232477 is a prime.

It is a super-2 number, since 2×20533232989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20533232983) 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, 10266616494 + 10266616495.

It is an arithmetic number, because the mean of its divisors is an integer number (10266616495).

Almost surely, 2^20533232989 is an apocalyptic number.

It is an amenable number.

20533232989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20533232989 is an equidigital number, since it uses as much as digits as its factorization.

20533232989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 46.

The spelling of 20533232989 in words is "twenty billion, five hundred thirty-three million, two hundred thirty-two thousand, nine hundred eighty-nine".