20388216 has 32 divisors (see below), whose sum is σ = 53654400. Its totient is φ = 6438240.

The previous prime is 20388211. The next prime is 20388283. The reversal of 20388216 is 61288302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20388211) by changing a digit.

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, 21900 + ... + 22811.

It is an arithmetic number, because the mean of its divisors is an integer number (1676700).

Almost surely, 2^20388216 is an apocalyptic number.

It is an amenable number.

20388216 is an abundant number, since it is smaller than the sum of its proper divisors (33266184).

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

20388216 is a wasteful number, since it uses less digits than its factorization.

20388216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44739 (or 44735 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20388216 is about 4515.3312170870. The cubic root of 20388216 is about 273.1868194892.

The spelling of 20388216 in words is "twenty million, three hundred eighty-eight thousand, two hundred sixteen".