Base | Representation |
---|---|
bin | 100110001011… |
… | …1111101101101 |
3 | 1101200011210021 |
4 | 1030113331231 |
5 | 20111133401 |
6 | 1553042141 |
7 | 332114362 |
oct | 114277555 |
9 | 41604707 |
10 | 20021101 |
11 | 10335171 |
12 | 6856351 |
13 | 41bcc09 |
14 | 2932469 |
15 | 1b572a1 |
hex | 1317f6d |
20021101 has 8 divisors (see below), whose sum is σ = 20560320. Its totient is φ = 19485312.
The previous prime is 20021093. The next prime is 20021137. The reversal of 20021101 is 10112002.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 20021101 - 23 = 20021093 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20021171) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14520 + ... + 15838.
It is an arithmetic number, because the mean of its divisors is an integer number (2570040).
Almost surely, 220021101 is an apocalyptic number.
It is an amenable number.
20021101 is a deficient number, since it is larger than the sum of its proper divisors (539219).
20021101 is a wasteful number, since it uses less digits than its factorization.
20021101 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1715.
The product of its (nonzero) digits is 4, while the sum is 7.
The square root of 20021101 is about 4474.4944965884. The cubic root of 20021101 is about 271.5371896505.
Adding to 20021101 its reverse (10112002), we get a palindrome (30133103).
Subtracting from 20021101 its reverse (10112002), we obtain a palindrome (9909099).
The spelling of 20021101 in words is "twenty million, twenty-one thousand, one hundred one".
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