205245741720 has 32 divisors (see below), whose sum is σ = 615737225520. Its totient is φ = 54732197760.

The previous prime is 205245741707. The next prime is 205245741787. The reversal of 205245741720 is 27147542502.

It is a happy number.

It is a congruent number.

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, 855190471 + ... + 855190710.

Almost surely, 2^205245741720 is an apocalyptic number.

205245741720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205245741720 is an abundant number, since it is smaller than the sum of its proper divisors (410491483800).

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

205245741720 is a wasteful number, since it uses less digits than its factorization.

205245741720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710381195 (or 1710381191 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 39.

The spelling of 205245741720 in words is "two hundred five billion, two hundred forty-five million, seven hundred forty-one thousand, seven hundred twenty".