20408411 has 2 divisors, whose sum is σ = 20408412. Its totient is φ = 20408410.

The previous prime is 20408393. The next prime is 20408419. The reversal of 20408411 is 11480402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20408411 - 2¹⁸ = 20146267 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20408419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10204205 + 10204206.

It is an arithmetic number, because the mean of its divisors is an integer number (10204206).

Almost surely, 2^20408411 is an apocalyptic number.

20408411 is a deficient number, since it is larger than the sum of its proper divisors (1).

20408411 is an equidigital number, since it uses as much as digits as its factorization.

20408411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 20408411 is about 4517.5669336491. The cubic root of 20408411 is about 273.2769890140.

Adding to 20408411 its reverse (11480402), we get a palindrome (31888813).

The spelling of 20408411 in words is "twenty million, four hundred eight thousand, four hundred eleven".