20126256127178 has 4 divisors (see below), whose sum is σ = 30189384190770. Its totient is φ = 10063128063588.

The previous prime is 20126256127177. The next prime is 20126256127181. The reversal of 20126256127178 is 87172165262102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18812717793769 + 1313538333409 = 4337363^2 + 1146097^2 .

It is not an unprimeable number, because it can be changed into a prime (20126256127177) by changing a digit.

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 as a sum of consecutive naturals, namely, 5031564031793 + ... + 5031564031796.

Almost surely, 2^{20126256127178} is an apocalyptic number.

20126256127178 is a deficient number, since it is larger than the sum of its proper divisors (10063128063592).

20126256127178 is a wasteful number, since it uses less digits than its factorization.

20126256127178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10063128063591.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The spelling of 20126256127178 in words is "twenty trillion, one hundred twenty-six billion, two hundred fifty-six million, one hundred twenty-seven thousand, one hundred seventy-eight".