20082809 has 2 divisors, whose sum is σ = 20082810. Its totient is φ = 20082808.

The previous prime is 20082787. The next prime is 20082817. The reversal of 20082809 is 90828002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11202409 + 8880400 = 3347^2 + 2980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20082809 is a prime.

It is equal to p_1275554 and since 20082809 and 1275554 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20082869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10041404 + 10041405.

It is an arithmetic number, because the mean of its divisors is an integer number (10041405).

Almost surely, 2^20082809 is an apocalyptic number.

It is an amenable number.

20082809 is a deficient number, since it is larger than the sum of its proper divisors (1).

20082809 is an equidigital number, since it uses as much as digits as its factorization.

20082809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 20082809 is about 4481.3847190350. The cubic root of 20082809 is about 271.8158761468.

The spelling of 20082809 in words is "twenty million, eighty-two thousand, eight hundred nine".