20456542442451 has 8 divisors (see below), whose sum is σ = 27298252786320. Its totient is φ = 13626263530112.

The previous prime is 20456542442419. The next prime is 20456542442467. The reversal of 20456542442451 is 15424424565402.

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 20456542442451 - 2⁵ = 20456542442419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20456542442451.

It is not an unprimeable number, because it can be changed into a prime (20456542442351) 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, 2857853706 + ... + 2857860863.

It is an arithmetic number, because the mean of its divisors is an integer number (3412281598290).

Almost surely, 2^{20456542442451} is an apocalyptic number.

20456542442451 is a deficient number, since it is larger than the sum of its proper divisors (6841710343869).

20456542442451 is a wasteful number, since it uses less digits than its factorization.

20456542442451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5715715765.

The product of its (nonzero) digits is 6144000, while the sum is 48.

The spelling of 20456542442451 in words is "twenty trillion, four hundred fifty-six billion, five hundred forty-two million, four hundred forty-two thousand, four hundred fifty-one".