20430784 has 28 divisors (see below), whose sum is σ = 44229528. Its totient is φ = 9286400.

The previous prime is 20430769. The next prime is 20430793. The reversal of 20430784 is 48703402.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13807 + ... + 15214.

It is an arithmetic number, because the mean of its divisors is an integer number (1579626).

Almost surely, 2^20430784 is an apocalyptic number.

It is an amenable number.

20430784 is an abundant number, since it is smaller than the sum of its proper divisors (23798744).

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

20430784 is a wasteful number, since it uses less digits than its factorization.

20430784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29044 (or 29034 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 20430784 is about 4520.0424776765. The cubic root of 20430784 is about 273.3768137585.

The spelling of 20430784 in words is "twenty million, four hundred thirty thousand, seven hundred eighty-four".