20580409 has 2 divisors, whose sum is σ = 20580410. Its totient is φ = 20580408.

The previous prime is 20580403. The next prime is 20580419. The reversal of 20580409 is 90408502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11580409 + 9000000 = 3403^2 + 3000^2 .

It is a cyclic number.

It is not a de Polignac number, because 20580409 - 2⁷ = 20580281 is a prime.

It is not a weakly prime, because it can be changed into another prime (20580403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10290204 + 10290205.

It is an arithmetic number, because the mean of its divisors is an integer number (10290205).

Almost surely, 2^20580409 is an apocalyptic number.

It is an amenable number.

20580409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20580409 is an equidigital number, since it uses as much as digits as its factorization.

20580409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 20580409 is about 4536.5635672831. The cubic root of 20580409 is about 274.0425502676.

The spelling of 20580409 in words is "twenty million, five hundred eighty thousand, four hundred nine".