220666380 has 96 divisors (see below), whose sum is σ = 709551360. Its totient is φ = 50676480.

The previous prime is 220666351. The next prime is 220666403. The reversal of 220666380 is 83666022.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 3742 + ... + 21338.

It is an arithmetic number, because the mean of its divisors is an integer number (7391160).

Almost surely, 2^220666380 is an apocalyptic number.

220666380 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 220666380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354775680).

220666380 is an abundant number, since it is smaller than the sum of its proper divisors (488884980).

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

220666380 is a wasteful number, since it uses less digits than its factorization.

220666380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17639 (or 17637 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 220666380 is about 14854.8436545122. The cubic root of 220666380 is about 604.2899759620.

It can be divided in two parts, 2206 and 66380, that added together give a palindrome (68586).

The spelling of 220666380 in words is "two hundred twenty million, six hundred sixty-six thousand, three hundred eighty".