| Base | Representation |
|---|---|
| bin | 10010101111010100… |
| … | …110000011011010100 |
| 3 | 1220221021211010102100 |
| 4 | 102233110300123110 |
| 5 | 312202024320340 |
| 6 | 13124341442100 |
| 7 | 1311424265625 |
| oct | 225724603324 |
| 9 | 56837733370 |
| 10 | 20121323220 |
| 11 | 8595a64a49 |
| 12 | 3a96710330 |
| 13 | 1b88875c1b |
| 14 | d8c467a4c |
| 15 | 7cb733830 |
| hex | 4af5306d4 |
20121323220 has 144 divisors (see below), whose sum is σ = 65044062720. Its totient is φ = 5023147008.
The previous prime is 20121323213. The next prime is 20121323231. The reversal of 20121323220 is 2232312102.
20121323220 is a `hidden beast` number, since 2 + 0 + 121 + 323 + 220 = 666.
It is a super-2 number, since 2×201213232202 (a number of 21 digits) contains 22 as substring.
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 = 20121323193 and 20121323202.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142876 + ... + 246284.
It is an arithmetic number, because the mean of its divisors is an integer number (451694880).
Almost surely, 220121323220 is an apocalyptic number.
20121323220 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 20121323220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32522031360).
20121323220 is an abundant number, since it is smaller than the sum of its proper divisors (44922739500).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20121323220 is a wasteful number, since it uses less digits than its factorization.
20121323220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 103494 (or 103489 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 18.
Adding to 20121323220 its reverse (2232312102), we get a palindrome (22353635322).
The spelling of 20121323220 in words is "twenty billion, one hundred twenty-one million, three hundred twenty-three thousand, two hundred twenty".
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