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220436 = 2255109

220436 has 6 divisors (see below), whose sum is σ = 385770. Its totient is φ = 110216.

The previous prime is 220421. The next prime is 220447. The reversal of 220436 is 634022.

220436 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 211600 + 8836 = 460^2 + 94^2 .

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 220436.

It is an unprimeable number.

220436 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 as a sum of consecutive naturals, namely, 27551 + ... + 27558.

It is an arithmetic number, because the mean of its divisors is an integer number (64295).

2220436 is an apocalyptic number.

It is an amenable number.

220436 is a deficient number, since it is larger than the sum of its proper divisors (165334).

220436 is a wasteful number, since it uses less digits than its factorization.

220436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55113 (or 55111 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 220436 is about 469.5061234957. The cubic root of 220436 is about 60.4079605899.

Adding to 220436 its reverse (634022), we get a palindrome (854458).

It can be divided in two parts, 220 and 436, that added together give a palindrome (656).

The spelling of 220436 in words is "two hundred twenty thousand, four hundred thirty-six".

Divisors: 1 2 4 55109 110218 220436