20117587 has 12 divisors (see below), whose sum is σ = 23702880. Its totient is φ = 17022096.

The previous prime is 20117567. The next prime is 20117611. The reversal of 20117587 is 78571102.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20117587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20117527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1273 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (1975240).

Almost surely, 2^20117587 is an apocalyptic number.

20117587 is a deficient number, since it is larger than the sum of its proper divisors (3585293).

20117587 is an equidigital number, since it uses as much as digits as its factorization.

20117587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5290 (or 5283 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 20117587 is about 4485.2633144555. The cubic root of 20117587 is about 271.9726895518.

Adding to 20117587 its reverse (78571102), we get a palindrome (98688689).

The spelling of 20117587 in words is "twenty million, one hundred seventeen thousand, five hundred eighty-seven".