20155443254 has 4 divisors (see below), whose sum is σ = 30233164884. Its totient is φ = 10077721626.

The previous prime is 20155443251. The next prime is 20155443289. The reversal of 20155443254 is 45234455102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45234455102 = 2 ⋅22617227551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155443251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5038860812 + ... + 5038860815.

It is an arithmetic number, because the mean of its divisors is an integer number (7558291221).

Almost surely, 2^20155443254 is an apocalyptic number.

20155443254 is a deficient number, since it is larger than the sum of its proper divisors (10077721630).

20155443254 is a wasteful number, since it uses less digits than its factorization.

20155443254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10077721629.

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 20155443254 its reverse (45234455102), we get a palindrome (65389898356).

The spelling of 20155443254 in words is "twenty billion, one hundred fifty-five million, four hundred forty-three thousand, two hundred fifty-four".