20117866 has 8 divisors (see below), whose sum is σ = 30250080. Its totient is φ = 10034508.

The previous prime is 20117863. The next prime is 20117869. The reversal of 20117866 is 66871102.

It is an interprime number because it is at equal distance from previous prime (20117863) and next prime (20117869).

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

It is not an unprimeable number, because it can be changed into a prime (20117863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11166 + ... + 12841.

It is an arithmetic number, because the mean of its divisors is an integer number (3781260).

Almost surely, 2^20117866 is an apocalyptic number.

20117866 is a deficient number, since it is larger than the sum of its proper divisors (10132214).

20117866 is a wasteful number, since it uses less digits than its factorization.

20117866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24428.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 20117866 is about 4485.2944162006. The cubic root of 20117866 is about 271.9739468270.

Adding to 20117866 its reverse (66871102), we get a palindrome (86988968).

The spelling of 20117866 in words is "twenty million, one hundred seventeen thousand, eight hundred sixty-six".