| Base | Representation |
|---|---|
| bin | 101001100100… |
| … | …1010000000000 |
| 3 | 1112000100021100 |
| 4 | 1103021100000 |
| 5 | 21034431330 |
| 6 | 2055054400 |
| 7 | 353155503 |
| oct | 123112000 |
| 9 | 45010240 |
| 10 | 21795840 |
| 11 | 113375a0 |
| 12 | 7371400 |
| 13 | 4691961 |
| 14 | 2c7513a |
| 15 | 1da8060 |
| hex | 14c9400 |
21795840 has 264 divisors, whose sum is σ = 84303648. Its totient is φ = 5160960.
The previous prime is 21795817. The next prime is 21795847. The reversal of 21795840 is 4859712.
21795840 is a `hidden beast` number, since 2 + 1 + 79 + 584 + 0 = 666.
It is a tau number, because it is divible by the number of its divisors (264).
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a junction number, because it is equal to n+sod(n) for n = 21795795 and 21795804.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21795847) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 506859 + ... + 506901.
It is an arithmetic number, because the mean of its divisors is an integer number (319332).
Almost surely, 221795840 is an apocalyptic number.
21795840 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 21795840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42151824).
21795840 is an abundant number, since it is smaller than the sum of its proper divisors (62507808).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21795840 is a wasteful number, since it uses less digits than its factorization.
21795840 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 85 (or 64 counting only the distinct ones).
The product of its (nonzero) digits is 20160, while the sum is 36.
The square root of 21795840 is about 4668.6015036625. The cubic root of 21795840 is about 279.3344737996.
The spelling of 21795840 in words is "twenty-one million, seven hundred ninety-five thousand, eight hundred forty".
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