20648466123289 has 4 divisors (see below), whose sum is σ = 20837901592420. Its totient is φ = 20459030654160.

The previous prime is 20648466123227. The next prime is 20648466123359. The reversal of 20648466123289 is 98232166484602.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18773086515264 + 1875379608025 = 4332792^2 + 1369445^2 .

It is a cyclic number.

It is not a de Polignac number, because 20648466123289 - 2¹³ = 20648466115097 is a prime.

It is a super-2 number, since 2×20648466123289² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20648466123209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94717734402 + ... + 94717734619.

It is an arithmetic number, because the mean of its divisors is an integer number (5209475398105).

Almost surely, 2^{20648466123289} is an apocalyptic number.

It is an amenable number.

20648466123289 is a deficient number, since it is larger than the sum of its proper divisors (189435469131).

20648466123289 is a wasteful number, since it uses less digits than its factorization.

20648466123289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189435469130.

The product of its (nonzero) digits is 47775744, while the sum is 61.

The spelling of 20648466123289 in words is "twenty trillion, six hundred forty-eight billion, four hundred sixty-six million, one hundred twenty-three thousand, two hundred eighty-nine".