20043242155 has 4 divisors (see below), whose sum is σ = 24051890592. Its totient is φ = 16034593720.

The previous prime is 20043242137. The next prime is 20043242161. The reversal of 20043242155 is 55124234002.

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

It is not a de Polignac number, because 20043242155 - 2¹³ = 20043233963 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004324211 + ... + 2004324220.

It is an arithmetic number, because the mean of its divisors is an integer number (6012972648).

Almost surely, 2^20043242155 is an apocalyptic number.

20043242155 is a deficient number, since it is larger than the sum of its proper divisors (4008648437).

20043242155 is an equidigital number, since it uses as much as digits as its factorization.

20043242155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008648436.

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 20043242155 its reverse (55124234002), we get a palindrome (75167476157).

The spelling of 20043242155 in words is "twenty billion, forty-three million, two hundred forty-two thousand, one hundred fifty-five".