20574409 has 2 divisors, whose sum is σ = 20574410. Its totient is φ = 20574408.

The previous prime is 20574401. The next prime is 20574431. The reversal of 20574409 is 90447502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16281225 + 4293184 = 4035^2 + 2072^2 .

It is a cyclic number.

It is not a de Polignac number, because 20574409 - 2³ = 20574401 is a prime.

It is not a weakly prime, because it can be changed into another prime (20574401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10287204 + 10287205.

It is an arithmetic number, because the mean of its divisors is an integer number (10287205).

Almost surely, 2^20574409 is an apocalyptic number.

It is an amenable number.

20574409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20574409 is an equidigital number, since it uses as much as digits as its factorization.

20574409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20574409 is about 4535.9022255776. The cubic root of 20574409 is about 274.0159162793.

The spelling of 20574409 in words is "twenty million, five hundred seventy-four thousand, four hundred nine".