20479117 has 2 divisors, whose sum is σ = 20479118. Its totient is φ = 20479116.

The previous prime is 20479097. The next prime is 20479139. The reversal of 20479117 is 71197402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19193161 + 1285956 = 4381^2 + 1134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20479117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20479187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10239558 + 10239559.

It is an arithmetic number, because the mean of its divisors is an integer number (10239559).

Almost surely, 2^20479117 is an apocalyptic number.

It is an amenable number.

20479117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20479117 is an equidigital number, since it uses as much as digits as its factorization.

20479117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 20479117 is about 4525.3858399036. The cubic root of 20479117 is about 273.5922193577.

The spelling of 20479117 in words is "twenty million, four hundred seventy-nine thousand, one hundred seventeen".