220001765 has 8 divisors (see below), whose sum is σ = 265187328. Its totient is φ = 175211280.

The previous prime is 220001731. The next prime is 220001767. The reversal of 220001765 is 567100022.

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

It is not a de Polignac number, because 220001765 - 2⁶ = 220001701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220001765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220001767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97541 + ... + 99770.

It is an arithmetic number, because the mean of its divisors is an integer number (33148416).

Almost surely, 2^220001765 is an apocalyptic number.

It is an amenable number.

220001765 is a deficient number, since it is larger than the sum of its proper divisors (45185563).

220001765 is a wasteful number, since it uses less digits than its factorization.

220001765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197539.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 220001765 is about 14832.4564722099. The cubic root of 220001765 is about 603.6826880650.

Adding to 220001765 its reverse (567100022), we get a palindrome (787101787).

The spelling of 220001765 in words is "two hundred twenty million, one thousand, seven hundred sixty-five".