20474009 has 2 divisors, whose sum is σ = 20474010. Its totient is φ = 20474008.

The previous prime is 20473997. The next prime is 20474011. The reversal of 20474009 is 90047402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 1507984 = 4355^2 + 1228^2 .

It is a cyclic number.

It is not a de Polignac number, because 20474009 - 2⁴ = 20473993 is a prime.

Together with 20474011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20474309) 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, 10237004 + 10237005.

It is an arithmetic number, because the mean of its divisors is an integer number (10237005).

Almost surely, 2^20474009 is an apocalyptic number.

It is an amenable number.

20474009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20474009 is an equidigital number, since it uses as much as digits as its factorization.

20474009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20474009 is about 4524.8214329408. The cubic root of 20474009 is about 273.5694705698.

The spelling of 20474009 in words is "twenty million, four hundred seventy-four thousand, nine".