220001705 has 16 divisors (see below), whose sum is σ = 329145984. Its totient is φ = 137143680.

The previous prime is 220001701. The next prime is 220001729. The reversal of 220001705 is 507100022.

It is not a de Polignac number, because 220001705 - 2² = 220001701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (220001701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285332 + ... + 286101.

It is an arithmetic number, because the mean of its divisors is an integer number (20571624).

Almost surely, 2^220001705 is an apocalyptic number.

It is an amenable number.

220001705 is a deficient number, since it is larger than the sum of its proper divisors (109144279).

220001705 is a wasteful number, since it uses less digits than its factorization.

220001705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571456.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 220001705 is about 14832.4544496182. The cubic root of 220001705 is about 603.6826331852.

Adding to 220001705 its reverse (507100022), we get a palindrome (727101727).

The spelling of 220001705 in words is "two hundred twenty million, one thousand, seven hundred five".