20424533 has 2 divisors, whose sum is σ = 20424534. Its totient is φ = 20424532.

The previous prime is 20424517. The next prime is 20424539. The reversal of 20424533 is 33542402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17123044 + 3301489 = 4138^2 + 1817^2 .

It is a cyclic number.

It is not a de Polignac number, because 20424533 - 2⁴ = 20424517 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20424499 and 20424508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20424539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212266 + 10212267.

It is an arithmetic number, because the mean of its divisors is an integer number (10212267).

Almost surely, 2^20424533 is an apocalyptic number.

It is an amenable number.

20424533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424533 is an equidigital number, since it uses as much as digits as its factorization.

20424533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 20424533 is about 4519.3509489749. The cubic root of 20424533 is about 273.3489301365.

Adding to 20424533 its reverse (33542402), we get a palindrome (53966935).

The spelling of 20424533 in words is "twenty million, four hundred twenty-four thousand, five hundred thirty-three".