20388672 has 196 divisors, whose sum is σ = 66629280. Its totient is φ = 6158592.

The previous prime is 20388583. The next prime is 20388727. The reversal of 20388672 is 27688302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 27 ways as a sum of consecutive naturals, for example, 886453 + ... + 886475.

Almost surely, 2^20388672 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 20388672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33314640).

20388672 is an abundant number, since it is smaller than the sum of its proper divisors (46240608).

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

20388672 is an equidigital number, since it uses as much as digits as its factorization.

20388672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20388672 is about 4515.3817114392. The cubic root of 20388672 is about 273.1888561601.

The spelling of 20388672 in words is "twenty million, three hundred eighty-eight thousand, six hundred seventy-two".