20480209 has 2 divisors, whose sum is σ = 20480210. Its totient is φ = 20480208.

The previous prime is 20480137. The next prime is 20480249. The reversal of 20480209 is 90208402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10870209 + 9610000 = 3297^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 20480209 - 2¹³ = 20472017 is a prime.

It is not a weakly prime, because it can be changed into another prime (20480249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10240104 + 10240105.

It is an arithmetic number, because the mean of its divisors is an integer number (10240105).

Almost surely, 2^20480209 is an apocalyptic number.

It is an amenable number.

20480209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20480209 is an equidigital number, since it uses as much as digits as its factorization.

20480209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 20480209 is about 4525.5064909908. The cubic root of 20480209 is about 273.5970821551.

The spelling of 20480209 in words is "twenty million, four hundred eighty thousand, two hundred nine".