20117688 has 32 divisors (see below), whose sum is σ = 51048960. Its totient is φ = 6605280.

The previous prime is 20117627. The next prime is 20117693. The reversal of 20117688 is 88671102.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 4648 + ... + 7863.

It is an arithmetic number, because the mean of its divisors is an integer number (1595280).

Almost surely, 2^20117688 is an apocalyptic number.

It is an amenable number.

20117688 is an abundant number, since it is smaller than the sum of its proper divisors (30931272).

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

20117688 is a wasteful number, since it uses less digits than its factorization.

20117688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12587 (or 12583 counting only the distinct ones).

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

The square root of 20117688 is about 4485.2745735350. The cubic root of 20117688 is about 271.9731446958.

The spelling of 20117688 in words is "twenty million, one hundred seventeen thousand, six hundred eighty-eight".