205720741 has 4 divisors (see below), whose sum is σ = 208032300. Its totient is φ = 203409184.

The previous prime is 205720727. The next prime is 205720759. The reversal of 205720741 is 147027502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22524516 + 183196225 = 4746^2 + 13535^2 .

It is a cyclic number.

It is not a de Polignac number, because 205720741 - 2¹⁷ = 205589669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205720721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1155646 + ... + 1155823.

It is an arithmetic number, because the mean of its divisors is an integer number (52008075).

Almost surely, 2^205720741 is an apocalyptic number.

It is an amenable number.

205720741 is a deficient number, since it is larger than the sum of its proper divisors (2311559).

205720741 is an equidigital number, since it uses as much as digits as its factorization.

205720741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311558.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 205720741 is about 14342.9683468939. The cubic root of 205720741 is about 590.3270627483.

The spelling of 205720741 in words is "two hundred five million, seven hundred twenty thousand, seven hundred forty-one".