20090530 has 16 divisors (see below), whose sum is σ = 36214200. Its totient is φ = 8024832.

The previous prime is 20090527. The next prime is 20090537. The reversal of 20090530 is 3509002.

It can be written as a sum of positive squares in 4 ways, for example, as 19439281 + 651249 = 4409^2 + 807^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20090498 and 20090507.

It is not an unprimeable number, because it can be changed into a prime (20090537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12196 + ... + 13744.

Almost surely, 2^20090530 is an apocalyptic number.

20090530 is a deficient number, since it is larger than the sum of its proper divisors (16123670).

20090530 is a wasteful number, since it uses less digits than its factorization.

20090530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2853.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 20090530 is about 4482.2460887372. The cubic root of 20090530 is about 271.8507056285.

Adding to 20090530 its reverse (3509002), we get a palindrome (23599532).

The spelling of 20090530 in words is "twenty million, ninety thousand, five hundred thirty".