20548728 has 80 divisors (see below), whose sum is σ = 60621000. Its totient is φ = 6485184.

The previous prime is 20548681. The next prime is 20548741. The reversal of 20548728 is 82784502.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 20548692 and 20548701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11478 + ... + 13146.

Almost surely, 2^20548728 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 20548728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30310500).

20548728 is an abundant number, since it is smaller than the sum of its proper divisors (40072272).

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

20548728 is a wasteful number, since it uses less digits than its factorization.

20548728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706 (or 1693 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 20548728 is about 4533.0704825758. The cubic root of 20548728 is about 273.9018598214.

The spelling of 20548728 in words is "twenty million, five hundred forty-eight thousand, seven hundred twenty-eight".