20103728 has 40 divisors (see below), whose sum is σ = 41418480. Its totient is φ = 9434880.

The previous prime is 20103701. The next prime is 20103737. The reversal of 20103728 is 82730102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16583 + ... + 17753.

It is an arithmetic number, because the mean of its divisors is an integer number (1035462).

Almost surely, 2^20103728 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 20103728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20709240).

20103728 is an abundant number, since it is smaller than the sum of its proper divisors (21314752).

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

20103728 is a wasteful number, since it uses less digits than its factorization.

20103728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245 (or 1239 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20103728 is about 4483.7180999702. The cubic root of 20103728 is about 271.9102212351.

The spelling of 20103728 in words is "twenty million, one hundred three thousand, seven hundred twenty-eight".