20105530 has 8 divisors (see below), whose sum is σ = 36189972. Its totient is φ = 8042208.

The previous prime is 20105521. The next prime is 20105549. The reversal of 20105530 is 3550102.

It can be written as a sum of positive squares in 2 ways, for example, as 20043529 + 62001 = 4477^2 + 249^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1005267 + ... + 1005286.

Almost surely, 2^20105530 is an apocalyptic number.

20105530 is a deficient number, since it is larger than the sum of its proper divisors (16084442).

20105530 is a wasteful number, since it uses less digits than its factorization.

20105530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010560.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 20105530 is about 4483.9190447643. The cubic root of 20105530 is about 271.9183452272.

Adding to 20105530 its reverse (3550102), we get a palindrome (23655632).

The spelling of 20105530 in words is "twenty million, one hundred five thousand, five hundred thirty".