21394920

Names of 21394920

• Cardinal: 21394920 can be written as Twenty-one million, three hundred ninety-four thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 2.139492 × 10⁷

Factors of 21394920

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 1502

Divisors of 21394920

• Number of divisors d(n): 64
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 20 24 30 40 60 120 131 262 393 524 655 786 1048 1310 1361 1572 1965 2620 2722 3144 3930 4083 5240 5444 6805 7860 8166 10888 13610 15720 16332 20415 27220 32664 40830 54440 81660 163320 178291 356582 534873 713164 891455 1069746 1426328 1782910 2139492 2674365 3565820 4278984 5348730 7131640 10697460 21394920
• Sum of all divisors σ(n): 64722240
• Sum of proper divisors (its aliquot sum) s(n): 43327320
• 21394920 is an abundant number, because the sum of its proper divisors (43327320) is greater than itself. Its abundance is 21932400

Bases of 21394920

• Binary: 1010001100111010111101000₂
• Hexadecimal: 0x14675E8
• Base-36: CQKFC

Squares and roots of 21394920

• 21394920 squared (21394920²) is 457742601806400
• 21394920 cubed (21394920³) is 9793366346239783488000
• The square root of 21394920 is 4625.4643010189
• The cube root of 21394920 is 277.6111396395

Scales and comparisons

• 21,394,920 seconds is equal to 35 weeks, 2 days, 15 hours, 2 minutes.
• To count from 1 to 21,394,920 would take you about ten hours!

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 21394920 cubic inches would be around 23.1 feet tall.

Recreational maths with 21394920

• 21394920 backwards is 02949312
• 21394920 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 21394920's digits is 30
• More coming soon!