Base | Representation |
---|---|
bin | 100111011010… |
… | …0010110100010 |
3 | 1102212201110220 |
4 | 1032310112202 |
5 | 20242133131 |
6 | 2014503510 |
7 | 340423044 |
oct | 116642642 |
9 | 42781426 |
10 | 20661666 |
11 | 10732463 |
12 | 6b04b96 |
13 | 438564c |
14 | 2a5ba94 |
15 | 1c31e96 |
hex | 13b45a2 |
20661666 has 16 divisors (see below), whose sum is σ = 41369088. Its totient is φ = 6879600.
The previous prime is 20661643. The next prime is 20661689. The reversal of 20661666 is 66616602.
It is an interprime number because it is at equal distance from previous prime (20661643) and next prime (20661689).
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7656 + ... + 9996.
It is an arithmetic number, because the mean of its divisors is an integer number (2585568).
Almost surely, 220661666 is an apocalyptic number.
20661666 is an abundant number, since it is smaller than the sum of its proper divisors (20707422).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20661666 is a wasteful number, since it uses less digits than its factorization.
20661666 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3817.
The product of its (nonzero) digits is 15552, while the sum is 33.
The square root of 20661666 is about 4545.5105323825. The cubic root of 20661666 is about 274.4027412482.
The spelling of 20661666 in words is "twenty million, six hundred sixty-one thousand, six hundred sixty-six".
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