205857740 has 24 divisors (see below), whose sum is σ = 471601872. Its totient is φ = 74857280.

The previous prime is 205857733. The next prime is 205857779. The reversal of 205857740 is 47758502.

205857740 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

205857740 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 205857694 and 205857703.

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, 467639 + ... + 468078.

It is an arithmetic number, because the mean of its divisors is an integer number (19650078).

Almost surely, 2^205857740 is an apocalyptic number.

205857740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205857740 is an abundant number, since it is smaller than the sum of its proper divisors (265744132).

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

205857740 is a wasteful number, since it uses less digits than its factorization.

205857740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935737 (or 935735 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 205857740 is about 14347.7433765732. The cubic root of 205857740 is about 590.4580757434.

The spelling of 205857740 in words is "two hundred five million, eight hundred fifty-seven thousand, seven hundred forty".