20506941266 has 16 divisors (see below), whose sum is σ = 36683224704. Its totient is φ = 8406572064.

The previous prime is 20506941263. The next prime is 20506941293. The reversal of 20506941266 is 66214960502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20506941263) 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 in 7 ways as a sum of consecutive naturals, for example, 31842755 + ... + 31843398.

It is an arithmetic number, because the mean of its divisors is an integer number (2292701544).

Almost surely, 2^20506941266 is an apocalyptic number.

20506941266 is a deficient number, since it is larger than the sum of its proper divisors (16176283438).

20506941266 is a wasteful number, since it uses less digits than its factorization.

20506941266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63686185.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 20506941266 in words is "twenty billion, five hundred six million, nine hundred forty-one thousand, two hundred sixty-six".