220638 has 16 divisors (see below), whose sum is σ = 481536. Its totient is φ = 66840.

The previous prime is 220613. The next prime is 220663. The reversal of 220638 is 836022.

It is an interprime number because it is at equal distance from previous prime (220613) and next prime (220663).

It is a super-2 number, since 2×220638² = 97362254088, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220638.

It is an unprimeable number.

220638 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 1606 + ... + 1737.

It is an arithmetic number, because the mean of its divisors is an integer number (30096).

2²²⁰⁶³⁸ is an apocalyptic number.

220638 is an abundant number, since it is smaller than the sum of its proper divisors (260898).

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

220638 is a wasteful number, since it uses less digits than its factorization.

220638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3359.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 220638 is about 469.7211939012. The cubic root of 220638 is about 60.4264068852.

It can be divided in two parts, 220 and 638, that added together give a palindrome (858).

The spelling of 220638 in words is "two hundred twenty thousand, six hundred thirty-eight".