20659291 has 2 divisors, whose sum is σ = 20659292. Its totient is φ = 20659290.

The previous prime is 20659279. The next prime is 20659319. The reversal of 20659291 is 19295602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20659291 - 2⁹ = 20658779 is a prime.

It is not a weakly prime, because it can be changed into another prime (20659201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10329645 + 10329646.

It is an arithmetic number, because the mean of its divisors is an integer number (10329646).

Almost surely, 2^20659291 is an apocalyptic number.

20659291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20659291 is an equidigital number, since it uses as much as digits as its factorization.

20659291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 20659291 is about 4545.2492780925. The cubic root of 20659291 is about 274.3922269060.

It can be divided in two parts, 2065 and 9291, that multiplied together give a triangular number (19185915 = T₆₁₉₄).

The spelling of 20659291 in words is "twenty million, six hundred fifty-nine thousand, two hundred ninety-one".