206420442440 has 32 divisors (see below), whose sum is σ = 464576015160. Its totient is φ = 82545062400.

The previous prime is 206420442433. The next prime is 206420442463. The reversal of 206420442440 is 44244024602.

It can be written as a sum of positive squares in 4 ways, for example, as 204088904644 + 2331537796 = 451762^2 + 48286^2 .

It is a junction number, because it is equal to n+sod(n) for n = 206420442397 and 206420442406.

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, 577301 + ... + 863780.

Almost surely, 2^206420442440 is an apocalyptic number.

206420442440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206420442440 is an abundant number, since it is smaller than the sum of its proper divisors (258155572720).

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

206420442440 is a wasteful number, since it uses less digits than its factorization.

206420442440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444673 (or 1444669 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 32.

The spelling of 206420442440 in words is "two hundred six billion, four hundred twenty million, four hundred forty-two thousand, four hundred forty".