20809130 has 8 divisors (see below), whose sum is σ = 37456452. Its totient is φ = 8323648.

The previous prime is 20809121. The next prime is 20809141. The reversal of 20809130 is 3190802.

It can be written as a sum of positive squares in 2 ways, for example, as 20784481 + 24649 = 4559^2 + 157^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20809096 and 20809105.

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 3 ways as a sum of consecutive naturals, for example, 1040447 + ... + 1040466.

Almost surely, 2^20809130 is an apocalyptic number.

20809130 is a deficient number, since it is larger than the sum of its proper divisors (16647322).

20809130 is a wasteful number, since it uses less digits than its factorization.

20809130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2080920.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 20809130 is about 4561.7025330462. The cubic root of 20809130 is about 275.0540059223.

Adding to 20809130 its reverse (3190802), we get a palindrome (23999932).

The spelling of 20809130 in words is "twenty million, eight hundred nine thousand, one hundred thirty".