220636 has 12 divisors (see below), whose sum is σ = 415912. Its totient is φ = 101808.

The previous prime is 220613. The next prime is 220663. The reversal of 220636 is 636022.

220636 is nontrivially palindromic in base 6.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

220636 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2070 + ... + 2173.

2²²⁰⁶³⁶ is an apocalyptic number.

220636 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

220636 is a deficient number, since it is larger than the sum of its proper divisors (195276).

220636 is a wasteful number, since it uses less digits than its factorization.

220636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260 (or 4258 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 220636 is about 469.7190649739. The cubic root of 220636 is about 60.4262243038.

Adding to 220636 its reverse (636022), we get a palindrome (856658).

The spelling of 220636 in words is "two hundred twenty thousand, six hundred thirty-six".