18919980

Names of 18919980

• Cardinal: 18919980 can be written as Eighteen million, nine hundred nineteen thousand, nine hundred eighty.

Scientific notation

• Scientific notation: 1.891998 × 10⁷

Factors of 18919980

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 256

Divisors of 18919980

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 5 6 9 10 12 15 17 18 20 27 30 34 36 45 51 54 60 68 81 85 90 102 108 135 153 162 170 180 204 229 243 255 270 306 324 340 405 458 459 486 510 540 612 687 765 810 916 918 972 1020 1145 1215 1374 1377 1530 1620 1836 2061 2290 2295 2430 2748 2754 3060 3435 3893 4122 4131 4580 4590 4860 5508 6183 6870 6885 7786 8244 8262 9180 10305 11679 12366 13740 13770 15572 16524 18549 19465 20610 20655 23358 24732 27540 30915 35037 37098 38930 41220 41310 46716 55647 58395 61830 70074 74196 77860 82620 92745 105111 111294 116790 123660 140148 175185 185490 210222 222588 233580 278235 315333 350370 370980 420444 525555 556470 630666 700740 945999 1051110 1112940 1261332 1576665 1891998 2102220 3153330 3783996 4729995 6306660 9459990 18919980
• Sum of all divisors σ(n): 63292320
• Sum of proper divisors (its aliquot sum) s(n): 44372340
• 18919980 is an abundant number, because the sum of its proper divisors (44372340) is greater than itself. Its abundance is 25452360

Bases of 18919980

• Binary: 1001000001011001000101100₂
• Hexadecimal: 0x120B22C
• Base-36: B9IR0

Squares and roots of 18919980

• 18919980 squared (18919980²) is 357965643200400
• 18919980 cubed (18919980³) is 6772702810038703992000
• The square root of 18919980 is 4349.7103351833
• The cube root of 18919980 is 266.4650316035

Scales and comparisons

• 18,919,980 seconds is equal to 31 weeks, 1 day, 23 hours, 33 minutes.
• To count from 1 to 18,919,980 would take you about forty-six weeks!

  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 18919980 cubic inches would be around 22.2 feet tall.

Recreational maths with 18919980

• 18919980 backwards is 08991981
• 18919980 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 18919980's digits is 45
• More coming soon!