20445533 has 2 divisors, whose sum is σ = 20445534. Its totient is φ = 20445532.

The previous prime is 20445521. The next prime is 20445541. The reversal of 20445533 is 33554402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17749369 + 2696164 = 4213^2 + 1642^2 .

It is a cyclic number.

It is not a de Polignac number, because 20445533 - 2¹⁰ = 20444509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20445583) 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, 10222766 + 10222767.

It is an arithmetic number, because the mean of its divisors is an integer number (10222767).

Almost surely, 2^20445533 is an apocalyptic number.

It is an amenable number.

20445533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20445533 is an equidigital number, since it uses as much as digits as its factorization.

20445533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 20445533 is about 4521.6736945516. The cubic root of 20445533 is about 273.4425815850.

Adding to 20445533 its reverse (33554402), we get a palindrome (53999935).

The spelling of 20445533 in words is "twenty million, four hundred forty-five thousand, five hundred thirty-three".