220011581 has 8 divisors (see below), whose sum is σ = 222597504. Its totient is φ = 217435680.

The previous prime is 220011553. The next prime is 220011601. The reversal of 220011581 is 185110022.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220011581 is a prime.

It is a super-2 number, since 2×220011581² = 96810191548239122, which contains 22 as substring.

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 (220011511) 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, 47321 + ... + 51761.

It is an arithmetic number, because the mean of its divisors is an integer number (27824688).

Almost surely, 2^220011581 is an apocalyptic number.

It is an amenable number.

220011581 is a deficient number, since it is larger than the sum of its proper divisors (2585923).

220011581 is a wasteful number, since it uses less digits than its factorization.

220011581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5011.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 220011581 is about 14832.7873644841. The cubic root of 220011581 is about 603.6916662674.

The spelling of 220011581 in words is "two hundred twenty million, eleven thousand, five hundred eighty-one".