220005531 has 16 divisors (see below), whose sum is σ = 326541600. Its totient is φ = 146397024.

The previous prime is 220005523. The next prime is 220005547. The reversal of 220005531 is 135500022.

It is a happy number.

It is not a de Polignac number, because 220005531 - 2³ = 220005523 is a prime.

It is a super-2 number, since 2×220005531² = 96804867341183922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (220005031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7725 + ... + 22353.

It is an arithmetic number, because the mean of its divisors is an integer number (20408850).

Almost surely, 2^220005531 is an apocalyptic number.

220005531 is a deficient number, since it is larger than the sum of its proper divisors (106536069).

220005531 is a wasteful number, since it uses less digits than its factorization.

220005531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15195 (or 15189 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 220005531 is about 14832.5834229914. The cubic root of 220005531 is about 603.6861326677.

Adding to 220005531 its reverse (135500022), we get a palindrome (355505553).

The spelling of 220005531 in words is "two hundred twenty million, five thousand, five hundred thirty-one".