20408117 has 2 divisors, whose sum is σ = 20408118. Its totient is φ = 20408116.

The previous prime is 20408081. The next prime is 20408189. The reversal of 20408117 is 71180402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12348196 + 8059921 = 3514^2 + 2839^2 .

It is a cyclic number.

It is not a de Polignac number, because 20408117 - 2⁸ = 20407861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20408092 and 20408101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20408917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10204058 + 10204059.

It is an arithmetic number, because the mean of its divisors is an integer number (10204059).

Almost surely, 2^20408117 is an apocalyptic number.

It is an amenable number.

20408117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20408117 is an equidigital number, since it uses as much as digits as its factorization.

20408117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20408117 is about 4517.5343938923. The cubic root of 20408117 is about 273.2756767476.

Adding to 20408117 its reverse (71180402), we get a palindrome (91588519).

The spelling of 20408117 in words is "twenty million, four hundred eight thousand, one hundred seventeen".