20117648825 has 12 divisors (see below), whose sum is σ = 24949535568. Its totient is φ = 16091763600.

The previous prime is 20117648779. The next prime is 20117648827. The reversal of 20117648825 is 52884671102.

It is not a de Polignac number, because 20117648825 - 2¹⁰ = 20117647801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20117648827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126830 + ... + 237320.

It is an arithmetic number, because the mean of its divisors is an integer number (2079127964).

Almost surely, 2^20117648825 is an apocalyptic number.

20117648825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20117648825 is a deficient number, since it is larger than the sum of its proper divisors (4831886743).

20117648825 is a wasteful number, since it uses less digits than its factorization.

20117648825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117784 (or 117779 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 20117648825 in words is "twenty billion, one hundred seventeen million, six hundred forty-eight thousand, eight hundred twenty-five".