20125644247755 has 24 divisors (see below), whose sum is σ = 34884554691168. Its totient is φ = 10733644728576.

The previous prime is 20125644247699. The next prime is 20125644247823. The reversal of 20125644247755 is 55774244652102.

20125644247755 is a `hidden beast` number, since 2 + 0 + 1 + 2 + 564 + 4 + 2 + 4 + 7 + 75 + 5 = 666.

It is not a de Polignac number, because 20125644247755 - 2³⁰ = 20124570505931 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 27413194 + ... + 28137776.

It is an arithmetic number, because the mean of its divisors is an integer number (1453523112132).

Almost surely, 2^{20125644247755} is an apocalyptic number.

20125644247755 is a deficient number, since it is larger than the sum of its proper divisors (14758910443413).

20125644247755 is a wasteful number, since it uses less digits than its factorization.

20125644247755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341827 (or 1341824 counting only the distinct ones).

The product of its (nonzero) digits is 18816000, while the sum is 54.

Adding to 20125644247755 its reverse (55774244652102), we get a palindrome (75899888899857).

The spelling of 20125644247755 in words is "twenty trillion, one hundred twenty-five billion, six hundred forty-four million, two hundred forty-seven thousand, seven hundred fifty-five".