| Base | Representation |
|---|---|
| bin | 100100000100… |
| … | …1100110010000 |
| 3 | 1022120220200200 |
| 4 | 1020021212100 |
| 5 | 14320214210 |
| 6 | 1513215200 |
| 7 | 316522632 |
| oct | 110114620 |
| 9 | 38526620 |
| 10 | 18913680 |
| 11 | a749145 |
| 12 | 6401500 |
| 13 | 3bc2b36 |
| 14 | 2724a52 |
| 15 | 19d90c0 |
| hex | 1209990 |
18913680 has 120 divisors (see below), whose sum is σ = 64367160. Its totient is φ = 4976640.
The previous prime is 18913667. The next prime is 18913691. The reversal of 18913680 is 8631981.
It can be written as a sum of positive squares in 4 ways, for example, as 5253264 + 13660416 = 2292^2 + 3696^2 .
It is a tau number, because it is divible by the number of its divisors (120).
It is a super-2 number, since 2×189136802 = 715454582284800, which contains 22 as substring.
It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78360 + ... + 78600.
It is an arithmetic number, because the mean of its divisors is an integer number (536393).
Almost surely, 218913680 is an apocalyptic number.
18913680 is a gapful number since it is divisible by the number (10) 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 18913680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32183580).
18913680 is an abundant number, since it is smaller than the sum of its proper divisors (45453480).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
18913680 is a wasteful number, since it uses less digits than its factorization.
18913680 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 369 (or 360 counting only the distinct ones).
The product of its (nonzero) digits is 10368, while the sum is 36.
The square root of 18913680 is about 4348.9860887338. The cubic root of 18913680 is about 266.4354523605.
The spelling of 18913680 in words is "eighteen million, nine hundred thirteen thousand, six hundred eighty".
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