20881433 has 2 divisors, whose sum is σ = 20881434. Its totient is φ = 20881432.

The previous prime is 20881381. The next prime is 20881439. The reversal of 20881433 is 33418802.

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., 13741849 + 7139584 = 3707^2 + 2672^2 .

It is a cyclic number.

It is not a de Polignac number, because 20881433 - 2⁶ = 20881369 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20881396 and 20881405.

It is not a weakly prime, because it can be changed into another prime (20881439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10440716 + 10440717.

It is an arithmetic number, because the mean of its divisors is an integer number (10440717).

Almost surely, 2^20881433 is an apocalyptic number.

It is an amenable number.

20881433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20881433 is an equidigital number, since it uses as much as digits as its factorization.

20881433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 20881433 is about 4569.6206625933. The cubic root of 20881433 is about 275.3722034456.

The spelling of 20881433 in words is "twenty million, eight hundred eighty-one thousand, four hundred thirty-three".