205720513707 has 8 divisors (see below), whose sum is σ = 274308034000. Its totient is φ = 137140001280.

The previous prime is 205720513697. The next prime is 205720513709. The reversal of 205720513707 is 707315027502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205720513707 - 2⁶ = 205720513643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205720513709) 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, 1683082 + ... + 1801167.

It is an arithmetic number, because the mean of its divisors is an integer number (34288504250).

Almost surely, 2^205720513707 is an apocalyptic number.

205720513707 is a deficient number, since it is larger than the sum of its proper divisors (68587520293).

205720513707 is a wasteful number, since it uses less digits than its factorization.

205720513707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503933.

The product of its (nonzero) digits is 102900, while the sum is 39.

The spelling of 205720513707 in words is "two hundred five billion, seven hundred twenty million, five hundred thirteen thousand, seven hundred seven".