20585687 has 2 divisors, whose sum is σ = 20585688. Its totient is φ = 20585686.

The previous prime is 20585659. The next prime is 20585693. The reversal of 20585687 is 78658502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20585687 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 (20585627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10292843 + 10292844.

It is an arithmetic number, because the mean of its divisors is an integer number (10292844).

Almost surely, 2^20585687 is an apocalyptic number.

20585687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20585687 is an equidigital number, since it uses as much as digits as its factorization.

20585687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 20585687 is about 4537.1452478403. The cubic root of 20585687 is about 274.0659750199.

The spelling of 20585687 in words is "twenty million, five hundred eighty-five thousand, six hundred eighty-seven".