220312505 has 32 divisors (see below), whose sum is σ = 328335360. Its totient is φ = 138490560.

The previous prime is 220312487. The next prime is 220312513. The reversal of 220312505 is 505213022.

It is not a de Polignac number, because 220312505 - 2¹⁴ = 220296121 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15272 + ... + 25958.

It is an arithmetic number, because the mean of its divisors is an integer number (10260480).

Almost surely, 2^220312505 is an apocalyptic number.

It is an amenable number.

220312505 is a deficient number, since it is larger than the sum of its proper divisors (108022855).

220312505 is a wasteful number, since it uses less digits than its factorization.

220312505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10749.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 220312505 is about 14842.9277772278. The cubic root of 220312505 is about 603.9667768592.

Adding to 220312505 its reverse (505213022), we get a palindrome (725525527).

The spelling of 220312505 in words is "two hundred twenty million, three hundred twelve thousand, five hundred five".