Base | Representation |
---|---|
bin | 100110011101… |
… | …1001001100100 |
3 | 1101221111111000 |
4 | 1030323021210 |
5 | 20130241340 |
6 | 2000113300 |
7 | 333254505 |
oct | 114731144 |
9 | 41844430 |
10 | 20165220 |
11 | 10423479 |
12 | 6905830 |
13 | 42406aa |
14 | 296cbac |
15 | 1b84d30 |
hex | 133b264 |
20165220 has 96 divisors (see below), whose sum is σ = 63504000. Its totient is φ = 5311872.
The previous prime is 20165203. The next prime is 20165231. The reversal of 20165220 is 2256102.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 20165193 and 20165202.
It is an unprimeable number.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57606 + ... + 57954.
It is an arithmetic number, because the mean of its divisors is an integer number (661500).
Almost surely, 220165220 is an apocalyptic number.
20165220 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 20165220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31752000).
20165220 is an abundant number, since it is smaller than the sum of its proper divisors (43338780).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20165220 is a wasteful number, since it uses less digits than its factorization.
20165220 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 474 (or 466 counting only the distinct ones).
The product of its (nonzero) digits is 240, while the sum is 18.
The square root of 20165220 is about 4490.5701197064. The cubic root of 20165220 is about 272.1871729290.
The spelling of 20165220 in words is "twenty million, one hundred sixty-five thousand, two hundred twenty".
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