220538 has 4 divisors (see below), whose sum is σ = 330810. Its totient is φ = 110268.

The previous prime is 220537. The next prime is 220543. The reversal of 220538 is 835022.

220538 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 835022 = 2 ⋅417511.

It can be written as a sum of positive squares in only one way, i.e., 134689 + 85849 = 367^2 + 293^2 .

It is a nialpdrome in base 12.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220538.

It is not an unprimeable number, because it can be changed into a prime (220537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55133 + ... + 55136.

2²²⁰⁵³⁸ is an apocalyptic number.

220538 is a deficient number, since it is larger than the sum of its proper divisors (110272).

220538 is a wasteful number, since it uses less digits than its factorization.

220538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110271.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 220538 is about 469.6147357143. The cubic root of 220538 is about 60.4172764637.

The spelling of 220538 in words is "two hundred twenty thousand, five hundred thirty-eight".