11820420305 has 16 divisors (see below), whose sum is σ = 14306658240.
Its totient is φ = 9375092928.
The previous prime is 11820420301. The next prime is 11820420319. The reversal of 11820420305 is 50302402811.
It is a cyclic number.
It is not a de Polignac number, because 11820420305 - 22 = 11820420301 is a prime.
It is not an unprimeable number, because it can be changed into a prime (11820420301) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 497834 + ... + 521036.
It is an arithmetic number, because the mean of its divisors is an integer number (894166140).
Almost surely, 211820420305 is an apocalyptic number.
It is an amenable number.
11820420305 is a deficient number, since it is larger than the sum of its proper divisors (2486237935).
11820420305 is a wasteful number, since it uses less digits than its factorization.
11820420305 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 24080.
The product of its (nonzero) digits is 1920, while the sum is 26.
The spelling of 11820420305 in words is "eleven billion, eight hundred twenty million, four hundred twenty thousand, three hundred five".