20023009 has 2 divisors, whose sum is σ = 20023010. Its totient is φ = 20023008.

The previous prime is 20023001. The next prime is 20023027. The reversal of 20023009 is 90032002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14861025 + 5161984 = 3855^2 + 2272^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023009 - 2³ = 20023001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20022983 and 20023001.

It is not a weakly prime, because it can be changed into another prime (20023001) 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, 10011504 + 10011505.

It is an arithmetic number, because the mean of its divisors is an integer number (10011505).

Almost surely, 2^20023009 is an apocalyptic number.

It is an amenable number.

20023009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023009 is an equidigital number, since it uses as much as digits as its factorization.

20023009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 20023009 is about 4474.7076999509. The cubic root of 20023009 is about 271.5458151585.

The spelling of 20023009 in words is "twenty million, twenty-three thousand, nine".