20130828 has 12 divisors (see below), whose sum is σ = 46971960. Its totient is φ = 6710272.

The previous prime is 20130797. The next prime is 20130829. The reversal of 20130828 is 82803102.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 20130798 and 20130807.

It is not an unprimeable number, because it can be changed into a prime (20130829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 838773 + ... + 838796.

It is an arithmetic number, because the mean of its divisors is an integer number (3914330).

Almost surely, 2^20130828 is an apocalyptic number.

It is an amenable number.

20130828 is an abundant number, since it is smaller than the sum of its proper divisors (26841132).

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

20130828 is a wasteful number, since it uses less digits than its factorization.

20130828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677576 (or 1677574 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 20130828 is about 4486.7391276962. The cubic root of 20130828 is about 272.0323454902.

The spelling of 20130828 in words is "twenty million, one hundred thirty thousand, eight hundred twenty-eight".