Base | Representation |
---|---|
bin | 100111001110… |
… | …1001001101110 |
3 | 1102200220010100 |
4 | 1032131021232 |
5 | 20231113023 |
6 | 2012451530 |
7 | 336546021 |
oct | 116351156 |
9 | 42626110 |
10 | 20566638 |
11 | 10678024 |
12 | 6a79ba6 |
13 | 4351311 |
14 | 2a351b8 |
15 | 1c13c43 |
hex | 139d26e |
20566638 has 24 divisors (see below), whose sum is σ = 45293976. Its totient is φ = 6742800.
The previous prime is 20566631. The next prime is 20566657. The reversal of 20566638 is 83666502.
It is a super-3 number, since 3×205666383 (a number of 23 digits) contains 333 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20566631) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8268 + ... + 10463.
It is an arithmetic number, because the mean of its divisors is an integer number (1887249).
Almost surely, 220566638 is an apocalyptic number.
20566638 is an abundant number, since it is smaller than the sum of its proper divisors (24727338).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20566638 is a wasteful number, since it uses less digits than its factorization.
20566638 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 18800 (or 18797 counting only the distinct ones).
The product of its (nonzero) digits is 51840, while the sum is 36.
The square root of 20566638 is about 4535.0455345013. The cubic root of 20566638 is about 273.9814131282.
The spelling of 20566638 in words is "twenty million, five hundred sixty-six thousand, six hundred thirty-eight".
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