20117868 has 36 divisors (see below), whose sum is σ = 49873992. Its totient is φ = 6310400.

The previous prime is 20117863. The next prime is 20117869. The reversal of 20117868 is 86871102.

It is a happy number.

It is a super-2 number, since 2×20117868² = 809457225730848, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 568 + ... + 6368.

Almost surely, 2^20117868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20117868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24936996).

20117868 is an abundant number, since it is smaller than the sum of its proper divisors (29756124).

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

20117868 is a wasteful number, since it uses less digits than its factorization.

20117868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5842 (or 5823 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 20117868 is about 4485.2946391514. The cubic root of 20117868 is about 271.9739558397.

The spelling of 20117868 in words is "twenty million, one hundred seventeen thousand, eight hundred sixty-eight".