220478 has 8 divisors (see below), whose sum is σ = 345168. Its totient is φ = 105424.

The previous prime is 220471. The next prime is 220511. The reversal of 220478 is 874022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×220478² = 97221096968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2351 + ... + 2442.

It is an arithmetic number, because the mean of its divisors is an integer number (43146).

2²²⁰⁴⁷⁸ is an apocalyptic number.

220478 is a deficient number, since it is larger than the sum of its proper divisors (124690).

220478 is a wasteful number, since it uses less digits than its factorization.

220478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4818.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 220478 is about 469.5508492166. The cubic root of 220478 is about 60.4117968859.

The spelling of 220478 in words is "two hundred twenty thousand, four hundred seventy-eight".