220669840 has 20 divisors (see below), whose sum is σ = 513057564. Its totient is φ = 88267904.

The previous prime is 220669837. The next prime is 220669847. The reversal of 220669840 is 48966022.

It can be written as a sum of positive squares in 2 ways, for example, as 165791376 + 54878464 = 12876^2 + 7408^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 220669840.

It is not an unprimeable number, because it can be changed into a prime (220669847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1379107 + ... + 1379266.

Almost surely, 2^220669840 is an apocalyptic number.

220669840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220669840 is an abundant number, since it is smaller than the sum of its proper divisors (292387724).

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

220669840 is a wasteful number, since it uses less digits than its factorization.

220669840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2758386 (or 2758380 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 220669840 is about 14854.9601143860. The cubic root of 220669840 is about 604.2931343232.

The spelling of 220669840 in words is "two hundred twenty million, six hundred sixty-nine thousand, eight hundred forty".