20451443544544 has 24 divisors (see below), whose sum is σ = 40923841440888. Its totient is φ = 10058086988160.

The previous prime is 20451443544533. The next prime is 20451443544583. The reversal of 20451443544544 is 44544534415402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5238585022 + ... + 5238588925.

It is an arithmetic number, because the mean of its divisors is an integer number (1705160060037).

Almost surely, 2^{20451443544544} is an apocalyptic number.

It is an amenable number.

20451443544544 is an abundant number, since it is smaller than the sum of its proper divisors (20472397896344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20451443544544 is a wasteful number, since it uses less digits than its factorization.

20451443544544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10477174018 (or 10477174010 counting only the distinct ones).

The product of its (nonzero) digits is 12288000, while the sum is 49.

Adding to 20451443544544 its reverse (44544534415402), we get a palindrome (64995977959946).

The spelling of 20451443544544 in words is "twenty trillion, four hundred fifty-one billion, four hundred forty-three million, five hundred forty-four thousand, five hundred forty-four".