20024009 has 2 divisors, whose sum is σ = 20024010. Its totient is φ = 20024008.

The previous prime is 20023987. The next prime is 20024077. The reversal of 20024009 is 90042002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16024009 + 4000000 = 4003^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 20024009 - 2⁸ = 20023753 is a prime.

It is not a weakly prime, because it can be changed into another prime (20024509) 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, 10012004 + 10012005.

It is an arithmetic number, because the mean of its divisors is an integer number (10012005).

Almost surely, 2^20024009 is an apocalyptic number.

It is an amenable number.

20024009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20024009 is an equidigital number, since it uses as much as digits as its factorization.

20024009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20024009 is about 4474.8194376980. The cubic root of 20024009 is about 271.5503356461.

The spelling of 20024009 in words is "twenty million, twenty-four thousand, nine".