20830428 has 36 divisors (see below), whose sum is σ = 52907400. Its totient is φ = 6910176.

The previous prime is 20830421. The next prime is 20830429. The reversal of 20830428 is 82403802.

20830428 is a `hidden beast` number, since 208 + 30 + 428 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20830421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6898 + ... + 9446.

It is an arithmetic number, because the mean of its divisors is an integer number (1469650).

Almost surely, 2^20830428 is an apocalyptic number.

It is an amenable number.

20830428 is an abundant number, since it is smaller than the sum of its proper divisors (32076972).

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

20830428 is a wasteful number, since it uses less digits than its factorization.

20830428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2786 (or 2781 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20830428 is about 4564.0363714589. The cubic root of 20830428 is about 275.1478125475.

The spelling of 20830428 in words is "twenty million, eight hundred thirty thousand, four hundred twenty-eight".