209438545020 has 24 divisors (see below), whose sum is σ = 586427926224. Its totient is φ = 55850278656.

The previous prime is 209438545003. The next prime is 209438545027. The reversal of 209438545020 is 20545834902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209438545027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1745321149 + ... + 1745321268.

It is an arithmetic number, because the mean of its divisors is an integer number (24434496926).

Almost surely, 2^209438545020 is an apocalyptic number.

209438545020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209438545020 is an abundant number, since it is smaller than the sum of its proper divisors (376989381204).

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

209438545020 is a wasteful number, since it uses less digits than its factorization.

209438545020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3490642429 (or 3490642427 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 209438545020 in words is "two hundred nine billion, four hundred thirty-eight million, five hundred forty-five thousand, twenty".