205707742 has 16 divisors (see below), whose sum is σ = 318592512. Its totient is φ = 99550080.

The previous prime is 205707739. The next prime is 205707763. The reversal of 205707742 is 247707502.

It is a junction number, because it is equal to n+sod(n) for n = 205707698 and 205707707.

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, 538 + ... + 20290.

It is an arithmetic number, because the mean of its divisors is an integer number (19912032).

Almost surely, 2^205707742 is an apocalyptic number.

205707742 is a deficient number, since it is larger than the sum of its proper divisors (112884770).

205707742 is a wasteful number, since it uses less digits than its factorization.

205707742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19923.

The product of its (nonzero) digits is 27440, while the sum is 34.

The square root of 205707742 is about 14342.5151908583. The cubic root of 205707742 is about 590.3146287029.

The spelling of 205707742 in words is "two hundred five million, seven hundred seven thousand, seven hundred forty-two".