20117356 has 24 divisors (see below), whose sum is σ = 40352256. Its totient is φ = 8596560.

The previous prime is 20117351. The next prime is 20117359. The reversal of 20117356 is 65371102.

It is a self number, because there is not a number n which added to its sum of digits gives 20117356.

It is not an unprimeable number, because it can be changed into a prime (20117351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11235 + ... + 12901.

It is an arithmetic number, because the mean of its divisors is an integer number (1681344).

Almost surely, 2^20117356 is an apocalyptic number.

It is an amenable number.

20117356 is an abundant number, since it is smaller than the sum of its proper divisors (20234900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20117356 is a wasteful number, since it uses less digits than its factorization.

20117356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109 (or 2107 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20117356 is about 4485.2375633850. The cubic root of 20117356 is about 271.9716485732.

Adding to 20117356 its reverse (65371102), we get a palindrome (85488458).

The spelling of 20117356 in words is "twenty million, one hundred seventeen thousand, three hundred fifty-six".