20430342155 has 4 divisors (see below), whose sum is σ = 24516410592. Its totient is φ = 16344273720.

The previous prime is 20430342151. The next prime is 20430342187. The reversal of 20430342155 is 55124303402.

It is a happy number.

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

It is not a de Polignac number, because 20430342155 - 2² = 20430342151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20430342151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2043034211 + ... + 2043034220.

It is an arithmetic number, because the mean of its divisors is an integer number (6129102648).

Almost surely, 2^20430342155 is an apocalyptic number.

20430342155 is a deficient number, since it is larger than the sum of its proper divisors (4086068437).

20430342155 is an equidigital number, since it uses as much as digits as its factorization.

20430342155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4086068436.

The product of its (nonzero) digits is 14400, while the sum is 29.

Adding to 20430342155 its reverse (55124303402), we get a palindrome (75554645557).

The spelling of 20430342155 in words is "twenty billion, four hundred thirty million, three hundred forty-two thousand, one hundred fifty-five".