20306530 has 8 divisors (see below), whose sum is σ = 36551772. Its totient is φ = 8122608.

The previous prime is 20306527. The next prime is 20306543. The reversal of 20306530 is 3560302.

20306530 = 552² + 553² + ... + 611².

It can be written as a sum of positive squares in 2 ways, for example, as 20223009 + 83521 = 4497^2 + 289^2 .

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 = 20306498 and 20306507.

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, 1015317 + ... + 1015336.

Almost surely, 2^20306530 is an apocalyptic number.

20306530 is a deficient number, since it is larger than the sum of its proper divisors (16245242).

20306530 is a wasteful number, since it uses less digits than its factorization.

20306530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030660.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 20306530 is about 4506.2767336239. The cubic root of 20306530 is about 272.8214874158.

Adding to 20306530 its reverse (3560302), we get a palindrome (23866832).

The spelling of 20306530 in words is "twenty million, three hundred six thousand, five hundred thirty".