20879459 has 2 divisors, whose sum is σ = 20879460. Its totient is φ = 20879458.

The previous prime is 20879447. The next prime is 20879477. The reversal of 20879459 is 95497802.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20879459 - 2⁸ = 20879203 is a prime.

It is not a weakly prime, because it can be changed into another prime (20879479) 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, 10439729 + 10439730.

It is an arithmetic number, because the mean of its divisors is an integer number (10439730).

Almost surely, 2^20879459 is an apocalyptic number.

20879459 is a deficient number, since it is larger than the sum of its proper divisors (1).

20879459 is an equidigital number, since it uses as much as digits as its factorization.

20879459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 20879459 is about 4569.4046658181. The cubic root of 20879459 is about 275.3635258506.

The spelling of 20879459 in words is "twenty million, eight hundred seventy-nine thousand, four hundred fifty-nine".