245220 has 48 divisors (see below), whose sum is σ = 708288. Its totient is φ = 63360.

The previous prime is 245209. The next prime is 245251. The reversal of 245220 is 22542.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 245220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3627 + ... + 3693.

It is an arithmetic number, because the mean of its divisors is an integer number (14756).

2²⁴⁵²²⁰ is an apocalyptic number.

245220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 245220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354144).

245220 is an abundant number, since it is smaller than the sum of its proper divisors (463068).

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

245220 is a wasteful number, since it uses less digits than its factorization.

245220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 245220 is about 495.1969305236. The cubic root of 245220 is about 62.5919712609.

Adding to 245220 its reverse (22542), we get a palindrome (267762).

It can be divided in two parts, 245 and 220, that added together give a triangular number (465 = T₃₀).

The spelling of 245220 in words is "two hundred forty-five thousand, two hundred twenty".