20927609 has 2 divisors, whose sum is σ = 20927610. Its totient is φ = 20927608.

The previous prime is 20927603. The next prime is 20927639. The reversal of 20927609 is 90672902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13104400 + 7823209 = 3620^2 + 2797^2 .

It is a cyclic number.

It is not a de Polignac number, because 20927609 - 2⁴ = 20927593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20927603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10463804 + 10463805.

It is an arithmetic number, because the mean of its divisors is an integer number (10463805).

Almost surely, 2^20927609 is an apocalyptic number.

It is an amenable number.

20927609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20927609 is an equidigital number, since it uses as much as digits as its factorization.

20927609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 20927609 is about 4574.6703706387. The cubic root of 20927609 is about 275.5750347603.

The spelling of 20927609 in words is "twenty million, nine hundred twenty-seven thousand, six hundred nine".