20443451101551 has 16 divisors (see below), whose sum is σ = 30286699006720. Its totient is φ = 13628920249080.

The previous prime is 20443451101517. The next prime is 20443451101573. The reversal of 20443451101551 is 15510115434402.

20443451101551 is a `hidden beast` number, since 2 + 0 + 4 + 43 + 4 + 51 + 10 + 1 + 551 = 666.

It is not a de Polignac number, because 20443451101551 - 2¹⁸ = 20443450839407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443451101501) 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, 7787856 + ... + 10076586.

It is an arithmetic number, because the mean of its divisors is an integer number (1892918687920).

Almost surely, 2^{20443451101551} is an apocalyptic number.

20443451101551 is a deficient number, since it is larger than the sum of its proper divisors (9843247905169).

20443451101551 is a wasteful number, since it uses less digits than its factorization.

20443451101551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2619563 (or 2619557 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

Adding to 20443451101551 its reverse (15510115434402), we get a palindrome (35953566535953).

The spelling of 20443451101551 in words is "twenty trillion, four hundred forty-three billion, four hundred fifty-one million, one hundred one thousand, five hundred fifty-one".