220236660 has 144 divisors (see below), whose sum is σ = 771353856. Its totient is φ = 49821696.

The previous prime is 220236659. The next prime is 220236697. The reversal of 220236660 is 66632022.

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 47 ways as a sum of consecutive naturals, for example, 128932 + ... + 130628.

It is an arithmetic number, because the mean of its divisors is an integer number (5356624).

Almost surely, 2^220236660 is an apocalyptic number.

220236660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220236660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (385676928).

220236660 is an abundant number, since it is smaller than the sum of its proper divisors (551117196).

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

220236660 is a wasteful number, since it uses less digits than its factorization.

220236660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822 (or 1817 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 220236660 is about 14840.3726368309. The cubic root of 220236660 is about 603.8974615052.

Adding to 220236660 its reverse (66632022), we get a palindrome (286868682).

The spelling of 220236660 in words is "two hundred twenty million, two hundred thirty-six thousand, six hundred sixty".