20444531256251 has 8 divisors (see below), whose sum is σ = 21052828516608. Its totient is φ = 19841455432000.

The previous prime is 20444531256239. The next prime is 20444531256403. The reversal of 20444531256251 is 15265213544402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20444531256251 - 2²² = 20444527061947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20444531256211) 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 7 ways as a sum of consecutive naturals, for example, 1305351080 + ... + 1305366741.

It is an arithmetic number, because the mean of its divisors is an integer number (2631603564576).

Almost surely, 2^{20444531256251} is an apocalyptic number.

20444531256251 is a deficient number, since it is larger than the sum of its proper divisors (608297260357).

20444531256251 is a wasteful number, since it uses less digits than its factorization.

20444531256251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610718053.

The product of its (nonzero) digits is 1152000, while the sum is 44.

The spelling of 20444531256251 in words is "twenty trillion, four hundred forty-four billion, five hundred thirty-one million, two hundred fifty-six thousand, two hundred fifty-one".