20388888 has 128 divisors (see below), whose sum is σ = 62596800. Its totient is φ = 6110208.

The previous prime is 20388883. The next prime is 20388947. The reversal of 20388888 is 88888302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20388883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148756 + ... + 148892.

Almost surely, 2^20388888 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 20388888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31298400).

20388888 is an abundant number, since it is smaller than the sum of its proper divisors (42207912).

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

20388888 is a wasteful number, since it uses less digits than its factorization.

20388888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 45.

The square root of 20388888 is about 4515.4056296196. The cubic root of 20388888 is about 273.1898208884.

The spelling of 20388888 in words is "twenty million, three hundred eighty-eight thousand, eight hundred eighty-eight".