20043409 has 2 divisors, whose sum is σ = 20043410. Its totient is φ = 20043408.

The previous prime is 20043407. The next prime is 20043433. The reversal of 20043409 is 90434002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11370384 + 8673025 = 3372^2 + 2945^2 .

It is a cyclic number.

It is not a de Polignac number, because 20043409 - 2¹ = 20043407 is a prime.

Together with 20043407, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20043409.

It is not a weakly prime, because it can be changed into another prime (20043403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10021704 + 10021705.

It is an arithmetic number, because the mean of its divisors is an integer number (10021705).

Almost surely, 2^20043409 is an apocalyptic number.

It is an amenable number.

20043409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20043409 is an equidigital number, since it uses as much as digits as its factorization.

20043409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 20043409 is about 4476.9865981484. The cubic root of 20043409 is about 271.6380033408.

The spelling of 20043409 in words is "twenty million, forty-three thousand, four hundred nine".