Base | Representation |
---|---|
bin | 100011111001… |
… | …1101010001100 |
3 | 1022102100102112 |
4 | 1013303222030 |
5 | 14304330240 |
6 | 1511243152 |
7 | 315666641 |
oct | 107635214 |
9 | 38370375 |
10 | 18823820 |
11 | a697684 |
12 | 63794b8 |
13 | 3b90c72 |
14 | 26dddc8 |
15 | 19bc665 |
hex | 11f3a8c |
18823820 has 48 divisors (see below), whose sum is σ = 41357568. Its totient is φ = 7188480.
The previous prime is 18823799. The next prime is 18823841. The reversal of 18823820 is 2832881.
It is an interprime number because it is at equal distance from previous prime (18823799) and next prime (18823841).
It is an unprimeable number.
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, 59984 + ... + 60296.
It is an arithmetic number, because the mean of its divisors is an integer number (861616).
Almost surely, 218823820 is an apocalyptic number.
18823820 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 18823820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20678784).
18823820 is an abundant number, since it is smaller than the sum of its proper divisors (22533748).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
18823820 is a wasteful number, since it uses less digits than its factorization.
With its predecessor (18823819) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (450).
18823820 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 450 (or 448 counting only the distinct ones).
The product of its (nonzero) digits is 6144, while the sum is 32.
The square root of 18823820 is about 4338.6426448833. The cubic root of 18823820 is about 266.0128322149.
The spelling of 18823820 in words is "eighteen million, eight hundred twenty-three thousand, eight hundred twenty".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.078 sec. • engine limits •