205720250 has 16 divisors (see below), whose sum is σ = 385108776. Its totient is φ = 82288000.

The previous prime is 205720241. The next prime is 205720253. The reversal of 205720250 is 52027502.

It can be written as a sum of positive squares in 4 ways, for example, as 61984129 + 143736121 = 7873^2 + 11989^2 .

It is not an unprimeable number, because it can be changed into a prime (205720253) 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, 411191 + ... + 411690.

Almost surely, 2^205720250 is an apocalyptic number.

205720250 is a deficient number, since it is larger than the sum of its proper divisors (179388526).

205720250 is an equidigital number, since it uses as much as digits as its factorization.

205720250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822898 (or 822888 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 205720250 is about 14342.9512304825. The cubic root of 205720250 is about 590.3265930974.

Adding to 205720250 its reverse (52027502), we get a palindrome (257747752).

The spelling of 205720250 in words is "two hundred five million, seven hundred twenty thousand, two hundred fifty".