220741566 has 32 divisors (see below), whose sum is σ = 472013568. Its totient is φ = 68576640.

The previous prime is 220741553. The next prime is 220741579. The reversal of 220741566 is 665147022.

220741566 is a nontrivial binomial coefficient, being equal to C(21012, 2).

It is an interprime number because it is at equal distance from previous prime (220741553) and next prime (220741579).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1 + ... + 21011.

It is an arithmetic number, because the mean of its divisors is an integer number (14750424).

Almost surely, 2^220741566 is an apocalyptic number.

220741566 is the 21011-st triangular number and also the 10506-th hexagonal number.

220741566 is an abundant number, since it is smaller than the sum of its proper divisors (251272002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220741566 is a wasteful number, since it uses less digits than its factorization.

220741566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21136.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 220741566 is about 14857.3741286945. The cubic root of 220741566 is about 604.3585998985.

Adding to 220741566 its reverse (665147022), we get a palindrome (885888588).

The spelling of 220741566 in words is "two hundred twenty million, seven hundred forty-one thousand, five hundred sixty-six".