220671440 has 80 divisors (see below), whose sum is σ = 579070080. Its totient is φ = 77468160.

The previous prime is 220671431. The next prime is 220671461. The reversal of 220671440 is 44176022.

220671440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21197 + ... + 29843.

It is an arithmetic number, because the mean of its divisors is an integer number (7238376).

Almost surely, 2^220671440 is an apocalyptic number.

220671440 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 220671440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289535040).

220671440 is an abundant number, since it is smaller than the sum of its proper divisors (358398640).

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

220671440 is a wasteful number, since it uses less digits than its factorization.

220671440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8700 (or 8694 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 220671440 is about 14855.0139683543. The cubic root of 220671440 is about 604.2945948259.

The spelling of 220671440 in words is "two hundred twenty million, six hundred seventy-one thousand, four hundred forty".