20670479 has 2 divisors, whose sum is σ = 20670480. Its totient is φ = 20670478.

The previous prime is 20670467. The next prime is 20670497. The reversal of 20670479 is 97407602.

Together with next prime (20670497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20670479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20670449) 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, 10335239 + 10335240.

It is an arithmetic number, because the mean of its divisors is an integer number (10335240).

Almost surely, 2^20670479 is an apocalyptic number.

20670479 is a deficient number, since it is larger than the sum of its proper divisors (1).

20670479 is an equidigital number, since it uses as much as digits as its factorization.

20670479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 20670479 is about 4546.4798470905. The cubic root of 20670479 is about 274.4417501646.

The spelling of 20670479 in words is "twenty million, six hundred seventy thousand, four hundred seventy-nine".