20117388 has 48 divisors (see below), whose sum is σ = 49674240. Its totient is φ = 6326400.

The previous prime is 20117359. The next prime is 20117401. The reversal of 20117388 is 88371102.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14593 + ... + 15911.

It is an arithmetic number, because the mean of its divisors is an integer number (1034880).

Almost surely, 2^20117388 is an apocalyptic number.

It is an amenable number.

20117388 is an abundant number, since it is smaller than the sum of its proper divisors (29556852).

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

20117388 is a wasteful number, since it uses less digits than its factorization.

20117388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 1396 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 20117388 is about 4485.2411306417. The cubic root of 20117388 is about 271.9717927785.

The spelling of 20117388 in words is "twenty million, one hundred seventeen thousand, three hundred eighty-eight".