20425344430551 has 16 divisors (see below), whose sum is σ = 27266137017600. Its totient is φ = 13600725768000.

The previous prime is 20425344430549. The next prime is 20425344430571. The reversal of 20425344430551 is 15503444352402.

It is not a de Polignac number, because 20425344430551 - 2¹ = 20425344430549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20425344430571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50130750 + ... + 50536548.

It is an arithmetic number, because the mean of its divisors is an integer number (1704133563600).

Almost surely, 2^{20425344430551} is an apocalyptic number.

20425344430551 is a deficient number, since it is larger than the sum of its proper divisors (6840792587049).

20425344430551 is a wasteful number, since it uses less digits than its factorization.

20425344430551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425686.

The product of its (nonzero) digits is 1152000, while the sum is 42.

Adding to 20425344430551 its reverse (15503444352402), we get a palindrome (35928788782953).

The spelling of 20425344430551 in words is "twenty trillion, four hundred twenty-five billion, three hundred forty-four million, four hundred thirty thousand, five hundred fifty-one".