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220240661 = 1712955333
BaseRepresentation
bin11010010000010…
…01101100010101
3120100102101101112
431020021230111
5422340200121
633504304405
75313005024
oct1510115425
9510371345
10220240661
11103358083
1261912105
1336823124
14213708bb
151450675b
hexd209b15

220240661 has 4 divisors (see below), whose sum is σ = 233196012. Its totient is φ = 207285312.

The previous prime is 220240649. The next prime is 220240667. The reversal of 220240661 is 166042022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 195300625 + 24940036 = 13975^2 + 4994^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-220240661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220240667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6477650 + ... + 6477683.

It is an arithmetic number, because the mean of its divisors is an integer number (58299003).

Almost surely, 2220240661 is an apocalyptic number.

It is an amenable number.

220240661 is a deficient number, since it is larger than the sum of its proper divisors (12955351).

220240661 is a wasteful number, since it uses less digits than its factorization.

220240661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12955350.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 220240661 is about 14840.5074374160. The cubic root of 220240661 is about 603.9011184488.

Adding to 220240661 its reverse (166042022), we get a palindrome (386282683).

The spelling of 220240661 in words is "two hundred twenty million, two hundred forty thousand, six hundred sixty-one".

Divisors: 1 17 12955333 220240661