20309087 has 2 divisors, whose sum is σ = 20309088. Its totient is φ = 20309086.

The previous prime is 20309071. The next prime is 20309129. The reversal of 20309087 is 78090302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20309087 - 2⁴ = 20309071 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 (20309057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10154543 + 10154544.

It is an arithmetic number, because the mean of its divisors is an integer number (10154544).

Almost surely, 2^20309087 is an apocalyptic number.

20309087 is a deficient number, since it is larger than the sum of its proper divisors (1).

20309087 is an equidigital number, since it uses as much as digits as its factorization.

20309087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20309087 is about 4506.5604400696. The cubic root of 20309087 is about 272.8329381702.

Adding to 20309087 its reverse (78090302), we get a palindrome (98399389).

The spelling of 20309087 in words is "twenty million, three hundred nine thousand, eighty-seven".