20585081287 has 2 divisors, whose sum is σ = 20585081288. Its totient is φ = 20585081286.

The previous prime is 20585081267. The next prime is 20585081299. The reversal of 20585081287 is 78218058502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20585081287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20585081207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10292540643 + 10292540644.

It is an arithmetic number, because the mean of its divisors is an integer number (10292540644).

Almost surely, 2^20585081287 is an apocalyptic number.

20585081287 is a deficient number, since it is larger than the sum of its proper divisors (1).

20585081287 is an equidigital number, since it uses as much as digits as its factorization.

20585081287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 358400, while the sum is 46.

The spelling of 20585081287 in words is "twenty billion, five hundred eighty-five million, eighty-one thousand, two hundred eighty-seven".