20130155 has 4 divisors (see below), whose sum is σ = 24156192. Its totient is φ = 16104120.

The previous prime is 20130079. The next prime is 20130163. The reversal of 20130155 is 55103102.

20130155 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-20130155 is a prime.

It is a Duffinian number.

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, 2013011 + ... + 2013020.

It is an arithmetic number, because the mean of its divisors is an integer number (6039048).

Almost surely, 2^20130155 is an apocalyptic number.

20130155 is a deficient number, since it is larger than the sum of its proper divisors (4026037).

20130155 is an equidigital number, since it uses as much as digits as its factorization.

20130155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4026036.

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

The square root of 20130155 is about 4486.6641282806. The cubic root of 20130155 is about 272.0293139903.

Adding to 20130155 its reverse (55103102), we get a palindrome (75233257).

The spelling of 20130155 in words is "twenty million, one hundred thirty thousand, one hundred fifty-five".