Base | Representation |
---|---|
bin | 101000010001… |
… | …1101100011000 |
3 | 1110201220001210 |
4 | 1100203230120 |
5 | 20401231340 |
6 | 2032343120 |
7 | 344332461 |
oct | 120435430 |
9 | 43656053 |
10 | 21117720 |
11 | 10a14068 |
12 | 70a4aa0 |
13 | 44b50c0 |
14 | 2b39d68 |
15 | 1cc2180 |
hex | 1423b18 |
21117720 has 64 divisors (see below), whose sum is σ = 68231520. Its totient is φ = 5197824.
The previous prime is 21117709. The next prime is 21117737. The reversal of 21117720 is 2771112.
It is a happy number.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5209 + ... + 8328.
Almost surely, 221117720 is an apocalyptic number.
21117720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
21117720 is an abundant number, since it is smaller than the sum of its proper divisors (47113800).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21117720 is a wasteful number, since it uses less digits than its factorization.
21117720 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 13564 (or 13560 counting only the distinct ones).
The product of its (nonzero) digits is 196, while the sum is 21.
The square root of 21117720 is about 4595.4020498755. The cubic root of 21117720 is about 276.4069820212.
Adding to 21117720 its reverse (2771112), we get a palindrome (23888832).
The spelling of 21117720 in words is "twenty-one million, one hundred seventeen thousand, seven hundred twenty".
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