20412409 has 2 divisors, whose sum is σ = 20412410. Its totient is φ = 20412408.

The previous prime is 20412397. The next prime is 20412463. The reversal of 20412409 is 90421402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20250000 + 162409 = 4500^2 + 403^2 .

It is a cyclic number.

It is not a de Polignac number, because 20412409 - 2⁵ = 20412377 is a prime.

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 20412409.

It is not a weakly prime, because it can be changed into another prime (20412499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206204 + 10206205.

It is an arithmetic number, because the mean of its divisors is an integer number (10206205).

Almost surely, 2^20412409 is an apocalyptic number.

It is an amenable number.

20412409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20412409 is an equidigital number, since it uses as much as digits as its factorization.

20412409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20412409 is about 4518.0094068074. The cubic root of 20412409 is about 273.2948328018.

The spelling of 20412409 in words is "twenty million, four hundred twelve thousand, four hundred nine".