20115530 has 32 divisors (see below), whose sum is σ = 37380096. Its totient is φ = 7789824.

The previous prime is 20115527. The next prime is 20115553. The reversal of 20115530 is 3551102.

It is a junction number, because it is equal to n+sod(n) for n = 20115499 and 20115508.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 59522 + ... + 59858.

It is an arithmetic number, because the mean of its divisors is an integer number (1168128).

Almost surely, 2^20115530 is an apocalyptic number.

20115530 is a deficient number, since it is larger than the sum of its proper divisors (17264566).

20115530 is a wasteful number, since it uses less digits than its factorization.

20115530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 20115530 is about 4485.0340021008. The cubic root of 20115530 is about 271.9634196049.

Adding to 20115530 its reverse (3551102), we get a palindrome (23666632).

The spelling of 20115530 in words is "twenty million, one hundred fifteen thousand, five hundred thirty".