420020009 has 2 divisors, whose sum is σ = 420020010. Its totient is φ = 420020008.

The previous prime is 420019993. The next prime is 420020039. The reversal of 420020009 is 900020024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231040000 + 188980009 = 15200^2 + 13747^2 .

It is a cyclic number.

It is not a de Polignac number, because 420020009 - 2⁴ = 420019993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (420020039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210010004 + 210010005.

It is an arithmetic number, because the mean of its divisors is an integer number (210010005).

Almost surely, 2^420020009 is an apocalyptic number.

It is an amenable number.

420020009 is a deficient number, since it is larger than the sum of its proper divisors (1).

420020009 is an equidigital number, since it uses as much as digits as its factorization.

420020009 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 420020009 is about 20494.3896957192. The cubic root of 420020009 is about 748.8991309812.

The spelling of 420020009 in words is "four hundred twenty million, twenty thousand, nine".