---
id: 5900f3801000cf542c50fe93
challengeType: 5
title: 'Problem 20: Factorial digit sum'
videoUrl: ''
localeTitle: ''
---

## Description
undefined

## Instructions
undefined

## Tests
<section id='tests'>

```yml
tests:
  - text: ''
    testString: 'assert.strictEqual(sumFactorialDigits(10), 27, "<code>sumFactorialDigits(10)</code> should return 27.");'
  - text: ''
    testString: 'assert.strictEqual(sumFactorialDigits(25), 72, "<code>sumFactorialDigits(25)</code> should return 72.");'
  - text: ''
    testString: 'assert.strictEqual(sumFactorialDigits(50), 216, "<code>sumFactorialDigits(50)</code> should return 216.");'
  - text: ''
    testString: 'assert.strictEqual(sumFactorialDigits(75), 432, "<code>sumFactorialDigits(75)</code> should return 432.");'
  - text: ''
    testString: 'assert.strictEqual(sumFactorialDigits(100), 648, "<code>sumFactorialDigits(100)</code> should return 648.");'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
function sumFactorialDigits(n) {
  // Good luck!
  return n;
}

sumFactorialDigits(100);

```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```
</section>
