20117685 has 48 divisors (see below), whose sum is σ = 37953792. Its totient is φ = 9072000.

The previous prime is 20117627. The next prime is 20117693. The reversal of 20117685 is 58671102.

It is not a de Polignac number, because 20117685 - 2⁷ = 20117557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74100 + ... + 74370.

It is an arithmetic number, because the mean of its divisors is an integer number (790704).

Almost surely, 2^20117685 is an apocalyptic number.

It is an amenable number.

20117685 is a deficient number, since it is larger than the sum of its proper divisors (17836107).

20117685 is a wasteful number, since it uses less digits than its factorization.

20117685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 20117685 is about 4485.2742391073. The cubic root of 20117685 is about 271.9731311767.

Adding to 20117685 its reverse (58671102), we get a palindrome (78788787).

It can be divided in two parts, 20117 and 685, that added together give a palindrome (20802).

The spelling of 20117685 in words is "twenty million, one hundred seventeen thousand, six hundred eighty-five".