220312660 has 24 divisors (see below), whose sum is σ = 477582336. Its totient is φ = 85282080.

The previous prime is 220312621. The next prime is 220312709. The reversal of 220312660 is 66213022.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177052 + ... + 178291.

It is an arithmetic number, because the mean of its divisors is an integer number (19899264).

Almost surely, 2^220312660 is an apocalyptic number.

220312660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220312660 is an abundant number, since it is smaller than the sum of its proper divisors (257269676).

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

220312660 is a wasteful number, since it uses less digits than its factorization.

220312660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355383 (or 355381 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 220312660 is about 14842.9329985687. The cubic root of 220312660 is about 603.9669184986.

Adding to 220312660 its reverse (66213022), we get a palindrome (286525682).

The spelling of 220312660 in words is "two hundred twenty million, three hundred twelve thousand, six hundred sixty".