20424431021255 has 4 divisors (see below), whose sum is σ = 24509317225512. Its totient is φ = 16339544817000.

The previous prime is 20424431021243. The next prime is 20424431021329. The reversal of 20424431021255 is 55212013442402.

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

It is not a de Polignac number, because 20424431021255 - 2⁸ = 20424431020999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2042443102121 + ... + 2042443102130.

It is an arithmetic number, because the mean of its divisors is an integer number (6127329306378).

Almost surely, 2^{20424431021255} is an apocalyptic number.

20424431021255 is a deficient number, since it is larger than the sum of its proper divisors (4084886204257).

20424431021255 is an equidigital number, since it uses as much as digits as its factorization.

20424431021255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4084886204256.

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 20424431021255 its reverse (55212013442402), we get a palindrome (75636444463657).

The spelling of 20424431021255 in words is "twenty trillion, four hundred twenty-four billion, four hundred thirty-one million, twenty-one thousand, two hundred fifty-five".