20539433 has 2 divisors, whose sum is σ = 20539434. Its totient is φ = 20539432.

The previous prime is 20539427. The next prime is 20539481. The reversal of 20539433 is 33493502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19642624 + 896809 = 4432^2 + 947^2 .

It is a cyclic number.

It is not a de Polignac number, because 20539433 - 2⁶ = 20539369 is a prime.

It is a super-2 number, since 2×20539433² = 843736615922978, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20539396 and 20539405.

It is not a weakly prime, because it can be changed into another prime (20539933) 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, 10269716 + 10269717.

It is an arithmetic number, because the mean of its divisors is an integer number (10269717).

Almost surely, 2^20539433 is an apocalyptic number.

It is an amenable number.

20539433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20539433 is an equidigital number, since it uses as much as digits as its factorization.

20539433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 29.

The square root of 20539433 is about 4532.0451233411. The cubic root of 20539433 is about 273.8605547220.

The spelling of 20539433 in words is "twenty million, five hundred thirty-nine thousand, four hundred thirty-three".