20332728 has 96 divisors (see below), whose sum is σ = 61268400. Its totient is φ = 6244992.

The previous prime is 20332727. The next prime is 20332733. The reversal of 20332728 is 82723302.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20332727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36226 + ... + 36782.

Almost surely, 2^20332728 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 20332728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30634200).

20332728 is an abundant number, since it is smaller than the sum of its proper divisors (40935672).

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

20332728 is a wasteful number, since it uses less digits than its factorization.

20332728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20332728 is about 4509.1826310319. The cubic root of 20332728 is about 272.9387617745.

It can be divided in two parts, 2033 and 2728, that added together give a square (4761 = 69²).

The spelling of 20332728 in words is "twenty million, three hundred thirty-two thousand, seven hundred twenty-eight".