Base | Representation |
---|---|
bin | 100010101111… |
… | …1111101000100 |
3 | 1021021121112010 |
4 | 1011133331010 |
5 | 14131000240 |
6 | 1450254220 |
7 | 310600044 |
oct | 105377504 |
9 | 37247463 |
10 | 18218820 |
11 | a314084 |
12 | 6127370 |
13 | 3a0b789 |
14 | 25c3724 |
15 | 18ed280 |
hex | 115ff44 |
18218820 has 24 divisors (see below), whose sum is σ = 51012864. Its totient is φ = 4858336.
The previous prime is 18218819. The next prime is 18218821. The reversal of 18218820 is 2881281.
It is an interprime number because it is at equal distance from previous prime (18218819) and next prime (18218821).
It is a Harshad number since it is a multiple of its sum of digits (30).
It is not an unprimeable number, because it can be changed into a prime (18218821) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151764 + ... + 151883.
It is an arithmetic number, because the mean of its divisors is an integer number (2125536).
Almost surely, 218218820 is an apocalyptic number.
18218820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
18218820 is an abundant number, since it is smaller than the sum of its proper divisors (32794044).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
18218820 is a wasteful number, since it uses less digits than its factorization.
18218820 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 303659 (or 303657 counting only the distinct ones).
The product of its (nonzero) digits is 2048, while the sum is 30.
The square root of 18218820 is about 4268.3509696369. The cubic root of 18218820 is about 263.1318475132.
The spelling of 18218820 in words is "eighteen million, two hundred eighteen thousand, eight hundred twenty".
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