20330243533 has 2 divisors, whose sum is σ = 20330243534. Its totient is φ = 20330243532.

The previous prime is 20330243503. The next prime is 20330243539. The reversal of 20330243533 is 33534203302.

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., 19843511689 + 486731844 = 140867^2 + 22062^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20330243533 is a prime.

It is a super-2 number, since 2×20330243533² (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 (20330243539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165121766 + 10165121767.

It is an arithmetic number, because the mean of its divisors is an integer number (10165121767).

Almost surely, 2^20330243533 is an apocalyptic number.

It is an amenable number.

20330243533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20330243533 is an equidigital number, since it uses as much as digits as its factorization.

20330243533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 28.

Adding to 20330243533 its reverse (33534203302), we get a palindrome (53864446835).

The spelling of 20330243533 in words is "twenty billion, three hundred thirty million, two hundred forty-three thousand, five hundred thirty-three".