| Base | Representation |
|---|---|
| bin | 100110001011… |
| … | …1001110110100 |
| 3 | 1101200000200010 |
| 4 | 1030113032310 |
| 5 | 20111034400 |
| 6 | 1553020220 |
| 7 | 332102544 |
| oct | 114271664 |
| 9 | 41600603 |
| 10 | 20018100 |
| 11 | 10332993 |
| 12 | 6854670 |
| 13 | 41bb73b |
| 14 | 2931324 |
| 15 | 1b56450 |
| hex | 13173b4 |
20018100 has 72 divisors (see below), whose sum is σ = 59058720. Its totient is φ = 5233280.
The previous prime is 20018093. The next prime is 20018101. The reversal of 20018100 is 181002.
It is a happy number.
It is a super-2 number, since 2×200181002 = 801448655220000, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (12).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20018101) 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 23 ways as a sum of consecutive naturals, for example, 15271 + ... + 16529.
It is an arithmetic number, because the mean of its divisors is an integer number (820260).
Almost surely, 220018100 is an apocalyptic number.
20018100 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 20018100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29529360).
20018100 is an abundant number, since it is smaller than the sum of its proper divisors (39040620).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20018100 is a wasteful number, since it uses less digits than its factorization.
20018100 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1329 (or 1322 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 12.
The square root of 20018100 is about 4474.1591388774. The cubic root of 20018100 is about 271.5236219014.
Adding to 20018100 its reverse (181002), we get a palindrome (20199102).
It can be divided in two parts, 2001 and 8100, that added together give a palindrome (10101).
The spelling of 20018100 in words is "twenty million, eighteen thousand, one hundred".
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