206140405420 has 48 divisors (see below), whose sum is σ = 436956458400. Its totient is φ = 81682836480.

The previous prime is 206140405403. The next prime is 206140405439. The reversal of 206140405420 is 24504041602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19704151 + ... + 19714609.

It is an arithmetic number, because the mean of its divisors is an integer number (9103259550).

Almost surely, 2^206140405420 is an apocalyptic number.

206140405420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206140405420 is an abundant number, since it is smaller than the sum of its proper divisors (230816052980).

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

206140405420 is a wasteful number, since it uses less digits than its factorization.

206140405420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19618 (or 19616 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The spelling of 206140405420 in words is "two hundred six billion, one hundred forty million, four hundred five thousand, four hundred twenty".