20044009 has 2 divisors, whose sum is σ = 20044010. Its totient is φ = 20044008.

The previous prime is 20043967. The next prime is 20044027. The reversal of 20044009 is 90044002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14845609 + 5198400 = 3853^2 + 2280^2 .

It is a cyclic number.

It is not a de Polignac number, because 20044009 - 2¹³ = 20035817 is a prime.

It is not a weakly prime, because it can be changed into another prime (20044909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022004 + 10022005.

It is an arithmetic number, because the mean of its divisors is an integer number (10022005).

Almost surely, 2^20044009 is an apocalyptic number.

It is an amenable number.

20044009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20044009 is an equidigital number, since it uses as much as digits as its factorization.

20044009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 20044009 is about 4477.0536070054. The cubic root of 20044009 is about 271.6407138108.

It can be divided in two parts, 2004 and 4009, that multiplied together give a triangular number (8034036 = T₄₀₀₈).

The spelling of 20044009 in words is "twenty million, forty-four thousand, nine".