20117651 has 8 divisors (see below), whose sum is σ = 20448480. Its totient is φ = 19789632.

The previous prime is 20117627. The next prime is 20117693. The reversal of 20117651 is 15671102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20117651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20117611) 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 7 ways as a sum of consecutive naturals, for example, 17255 + ... + 18383.

It is an arithmetic number, because the mean of its divisors is an integer number (2556060).

Almost surely, 2^20117651 is an apocalyptic number.

20117651 is a deficient number, since it is larger than the sum of its proper divisors (330829).

20117651 is a wasteful number, since it uses less digits than its factorization.

20117651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 20117651 is about 4485.2704489250. The cubic root of 20117651 is about 271.9729779600.

Adding to 20117651 its reverse (15671102), we get a palindrome (35788753).

The spelling of 20117651 in words is "twenty million, one hundred seventeen thousand, six hundred fifty-one".