20130643 has 16 divisors (see below), whose sum is σ = 22256640. Its totient is φ = 18095616.

The previous prime is 20130599. The next prime is 20130647. The reversal of 20130643 is 34603102.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20130643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20130643.

It is not an unprimeable number, because it can be changed into a prime (20130647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146871 + ... + 147007.

It is an arithmetic number, because the mean of its divisors is an integer number (1391040).

Almost surely, 2^20130643 is an apocalyptic number.

20130643 is a deficient number, since it is larger than the sum of its proper divisors (2125997).

20130643 is a wasteful number, since it uses less digits than its factorization.

20130643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 20130643 is about 4486.7185113399. The cubic root of 20130643 is about 272.0315121723.

Adding to 20130643 its reverse (34603102), we get a palindrome (54733745).

The spelling of 20130643 in words is "twenty million, one hundred thirty thousand, six hundred forty-three".