20581230 has 16 divisors (see below), whose sum is σ = 49395024. Its totient is φ = 5488320.

The previous prime is 20581207. The next prime is 20581243. The reversal of 20581230 is 3218502.

It is a junction number, because it is equal to n+sod(n) for n = 20581197 and 20581206.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 342991 + ... + 343050.

It is an arithmetic number, because the mean of its divisors is an integer number (3087189).

Almost surely, 2^20581230 is an apocalyptic number.

20581230 is an abundant number, since it is smaller than the sum of its proper divisors (28813794).

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

20581230 is a wasteful number, since it uses less digits than its factorization.

20581230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686051.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20581230 is about 4536.6540533746. The cubic root of 20581230 is about 274.0461942824.

Adding to 20581230 its reverse (3218502), we get a palindrome (23799732).

The spelling of 20581230 in words is "twenty million, five hundred eighty-one thousand, two hundred thirty".