Base | Representation |
---|---|
bin | 100110000101… |
… | …1001101110000 |
3 | 1101120112011011 |
4 | 1030023031300 |
5 | 20103001010 |
6 | 1552000304 |
7 | 331506211 |
oct | 114131560 |
9 | 41515134 |
10 | 19968880 |
11 | 102a9a08 |
12 | 6830094 |
13 | 41a2209 |
14 | 291b408 |
15 | 1b46a8a |
hex | 130b370 |
19968880 has 40 divisors (see below), whose sum is σ = 49162032. Its totient is φ = 7517184.
The previous prime is 19968877. The next prime is 19968889. The reversal of 19968880 is 8886991.
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (40).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (19968889) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5982 + ... + 8701.
Almost surely, 219968880 is an apocalyptic number.
19968880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
19968880 is an abundant number, since it is smaller than the sum of its proper divisors (29193152).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
19968880 is a wasteful number, since it uses less digits than its factorization.
19968880 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 14713 (or 14707 counting only the distinct ones).
The product of its (nonzero) digits is 248832, while the sum is 49.
The square root of 19968880 is about 4468.6552787164. The cubic root of 19968880 is about 271.3009007807.
The spelling of 19968880 in words is "nineteen million, nine hundred sixty-eight thousand, eight hundred eighty".
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