205720801 has 16 divisors (see below), whose sum is σ = 244194048. Its totient is φ = 170841600.

The previous prime is 205720759. The next prime is 205720807. The reversal of 205720801 is 108027502.

It is a cyclic number.

It is not a de Polignac number, because 205720801 - 2⁷ = 205720673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205720807) 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 15 ways as a sum of consecutive naturals, for example, 6456 + ... + 21286.

It is an arithmetic number, because the mean of its divisors is an integer number (15262128).

Almost surely, 2^205720801 is an apocalyptic number.

It is an amenable number.

205720801 is a deficient number, since it is larger than the sum of its proper divisors (38473247).

205720801 is a wasteful number, since it uses less digits than its factorization.

205720801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14952.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 205720801 is about 14342.9704385110. The cubic root of 205720801 is about 590.3271201394.

The spelling of 205720801 in words is "two hundred five million, seven hundred twenty thousand, eight hundred one".