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220525 = 528821
BaseRepresentation
bin110101110101101101
3102012111121
4311311231
524024100
64420541
71605634
oct656555
9365447
10220525
11140758
12a7751
13794b6
145a51b
154551a
hex35d6d

220525 has 6 divisors (see below), whose sum is σ = 273482. Its totient is φ = 176400.

The previous prime is 220513. The next prime is 220529. The reversal of 220525 is 525022.

It can be written as a sum of positive squares in 3 ways, for example, as 21609 + 198916 = 147^2 + 446^2 .

It is not a de Polignac number, because 220525 - 29 = 220013 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 220499 and 220508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220529) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4386 + ... + 4435.

2220525 is an apocalyptic number.

220525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

220525 is a deficient number, since it is larger than the sum of its proper divisors (52957).

220525 is an equidigital number, since it uses as much as digits as its factorization.

220525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8831 (or 8826 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 220525 is about 469.6008943773. The cubic root of 220525 is about 60.4160893061.

Adding to 220525 its reverse (525022), we get a palindrome (745547).

The spelling of 220525 in words is "two hundred twenty thousand, five hundred twenty-five".

Divisors: 1 5 25 8821 44105 220525