20140728 has 48 divisors (see below), whose sum is σ = 51833880. Its totient is φ = 6521472.

The previous prime is 20140667. The next prime is 20140739. The reversal of 20140728 is 82704102.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 20140698 and 20140707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32550 + ... + 33162.

Almost surely, 2^20140728 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 20140728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25916940).

20140728 is an abundant number, since it is smaller than the sum of its proper divisors (31693152).

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

20140728 is a wasteful number, since it uses less digits than its factorization.

20140728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20140728 is about 4487.8422432167. The cubic root of 20140728 is about 272.0769318143.

The spelling of 20140728 in words is "twenty million, one hundred forty thousand, seven hundred twenty-eight".