205720072 has 8 divisors (see below), whose sum is σ = 385725150. Its totient is φ = 102860032.

The previous prime is 205720033. The next prime is 205720091. The reversal of 205720072 is 270027502.

It can be written as a sum of positive squares in only one way, i.e., 200675556 + 5044516 = 14166^2 + 2246^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12857497 + ... + 12857512.

Almost surely, 2^205720072 is an apocalyptic number.

It is an amenable number.

205720072 is a deficient number, since it is larger than the sum of its proper divisors (180005078).

205720072 is a wasteful number, since it uses less digits than its factorization.

205720072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25715015 (or 25715011 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 205720072 is about 14342.9450253426. The cubic root of 205720072 is about 590.3264228367.

Adding to 205720072 its reverse (270027502), we get a palindrome (475747574).

The spelling of 205720072 in words is "two hundred five million, seven hundred twenty thousand, seventy-two".