| Base | Representation |
|---|---|
| bin | 100111011010… |
| … | …1001100110100 |
| 3 | 1102212220020120 |
| 4 | 1032311030310 |
| 5 | 20242241030 |
| 6 | 2014531540 |
| 7 | 340436136 |
| oct | 116651464 |
| 9 | 42786216 |
| 10 | 20665140 |
| 11 | 10735031 |
| 12 | 6b06bb0 |
| 13 | 43870c2 |
| 14 | 2a5d056 |
| 15 | 1c33010 |
| hex | 13b5334 |
20665140 has 48 divisors (see below), whose sum is σ = 58244928. Its totient is φ = 5474304.
The previous prime is 20665133. The next prime is 20665147. The reversal of 20665140 is 4156602.
It is an interprime number because it is at equal distance from previous prime (20665133) and next prime (20665147).
It is a super-2 number, since 2×206651402 = 854096022439200, which contains 22 as substring.
It is a self number, because there is not a number n which added to its sum of digits gives 20665140.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20665147) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8724 + ... + 10836.
It is an arithmetic number, because the mean of its divisors is an integer number (1213436).
Almost surely, 220665140 is an apocalyptic number.
20665140 is a gapful number since it is divisible by the number (20) 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 20665140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29122464).
20665140 is an abundant number, since it is smaller than the sum of its proper divisors (37579788).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20665140 is a wasteful number, since it uses less digits than its factorization.
20665140 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2288 (or 2286 counting only the distinct ones).
The product of its (nonzero) digits is 1440, while the sum is 24.
The square root of 20665140 is about 4545.8926516142. The cubic root of 20665140 is about 274.4181195128.
The spelling of 20665140 in words is "twenty million, six hundred sixty-five thousand, one hundred forty".
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