20128498536386 has 4 divisors (see below), whose sum is σ = 30192747804582. Its totient is φ = 10064249268192.

The previous prime is 20128498536353. The next prime is 20128498536389. The reversal of 20128498536386 is 68363589482102.

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., 15544339202161 + 4584159334225 = 3942631^2 + 2141065^2 .

It is not an unprimeable number, because it can be changed into a prime (20128498536389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5032124634095 + ... + 5032124634098.

Almost surely, 2^{20128498536386} is an apocalyptic number.

20128498536386 is a deficient number, since it is larger than the sum of its proper divisors (10064249268196).

20128498536386 is a wasteful number, since it uses less digits than its factorization.

20128498536386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10064249268195.

The product of its (nonzero) digits is 119439360, while the sum is 65.

The spelling of 20128498536386 in words is "twenty trillion, one hundred twenty-eight billion, four hundred ninety-eight million, five hundred thirty-six thousand, three hundred eighty-six".