185220956420 has 12 divisors (see below), whose sum is σ = 388964008524. Its totient is φ = 74088382560.

The previous prime is 185220956413. The next prime is 185220956441. The reversal of 185220956420 is 24659022581.

It can be written as a sum of positive squares in 2 ways, for example, as 87662182084 + 97558774336 = 296078^2 + 312344^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4630523891 + ... + 4630523930.

It is an arithmetic number, because the mean of its divisors is an integer number (32413667377).

Almost surely, 2^185220956420 is an apocalyptic number.

185220956420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

185220956420 is an abundant number, since it is smaller than the sum of its proper divisors (203743052104).

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

185220956420 is a wasteful number, since it uses less digits than its factorization.

185220956420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9261047830 (or 9261047828 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 185220956420 in words is "one hundred eighty-five billion, two hundred twenty million, nine hundred fifty-six thousand, four hundred twenty".