| Base | Representation |
|---|---|
| bin | 100110110000… |
| … | …1110001110000 |
| 3 | 1102020112112000 |
| 4 | 1031201301300 |
| 5 | 20200322230 |
| 6 | 2003334000 |
| 7 | 334514004 |
| oct | 115416160 |
| 9 | 42215460 |
| 10 | 20323440 |
| 11 | 10521335 |
| 12 | 6981300 |
| 13 | 4297707 |
| 14 | 29b0704 |
| 15 | 1bb6b60 |
| hex | 1361c70 |
20323440 has 120 divisors (see below), whose sum is σ = 70732080. Its totient is φ = 5363712.
The previous prime is 20323427. The next prime is 20323441. The reversal of 20323440 is 4432302.
20323440 is a `hidden beast` number, since 203 + 23 + 440 = 666.
It is a tau number, because it is divible by the number of its divisors (120).
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20323441) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209472 + ... + 209568.
It is an arithmetic number, because the mean of its divisors is an integer number (589434).
Almost surely, 220323440 is an apocalyptic number.
20323440 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 20323440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35366040).
20323440 is an abundant number, since it is smaller than the sum of its proper divisors (50408640).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20323440 is an equidigital number, since it uses as much as digits as its factorization.
20323440 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 216 (or 107 counting only the distinct ones).
The product of its (nonzero) digits is 576, while the sum is 18.
The square root of 20323440 is about 4508.1526149854. The cubic root of 20323440 is about 272.8971959253.
Adding to 20323440 its reverse (4432302), we get a palindrome (24755742).
The spelling of 20323440 in words is "twenty million, three hundred twenty-three thousand, four hundred forty".
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