20117605 has 16 divisors (see below), whose sum is σ = 25173504. Its totient is φ = 15416640.

The previous prime is 20117567. The next prime is 20117611. The reversal of 20117605 is 50671102.

It is not a de Polignac number, because 20117605 - 2¹³ = 20109413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15979 + ... + 17191.

It is an arithmetic number, because the mean of its divisors is an integer number (1573344).

Almost surely, 2^20117605 is an apocalyptic number.

It is an amenable number.

20117605 is a deficient number, since it is larger than the sum of its proper divisors (5055899).

20117605 is a wasteful number, since it uses less digits than its factorization.

20117605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 20117605 is about 4485.2653210262. The cubic root of 20117605 is about 271.9727706667.

Adding to 20117605 its reverse (50671102), we get a palindrome (70788707).

The spelling of 20117605 in words is "twenty million, one hundred seventeen thousand, six hundred five".