206604644420 has 24 divisors (see below), whose sum is σ = 434702538648. Its totient is φ = 82483232000.

The previous prime is 206604644387. The next prime is 206604644437. The reversal of 206604644420 is 24446406602.

206604644420 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 28965997636 + 177638646784 = 170194^2 + 421472^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9903431 + ... + 9924270.

It is an arithmetic number, because the mean of its divisors is an integer number (18112605777).

Almost surely, 2^206604644420 is an apocalyptic number.

206604644420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206604644420 is an abundant number, since it is smaller than the sum of its proper divisors (228097894228).

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

206604644420 is a wasteful number, since it uses less digits than its factorization.

206604644420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19828231 (or 19828229 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 38.

The spelling of 206604644420 in words is "two hundred six billion, six hundred four million, six hundred forty-four thousand, four hundred twenty".