20261353775064 has 32 divisors (see below), whose sum is σ = 51731116024320. Its totient is φ = 6610087046816.

The previous prime is 20261353775021. The next prime is 20261353775081. The reversal of 20261353775064 is 46057735316202.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20261353774998 and 20261353775016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8981095404 + ... + 8981097659.

It is an arithmetic number, because the mean of its divisors is an integer number (1616597375760).

Almost surely, 2^{20261353775064} is an apocalyptic number.

20261353775064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20261353775064 is an abundant number, since it is smaller than the sum of its proper divisors (31469762249256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20261353775064 is a wasteful number, since it uses less digits than its factorization.

20261353775064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17962193119 (or 17962193115 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 51.

The spelling of 20261353775064 in words is "twenty trillion, two hundred sixty-one billion, three hundred fifty-three million, seven hundred seventy-five thousand, sixty-four".