Base | Representation |
---|---|
bin | 100111001000… |
… | …1000000000000 |
3 | 1102121100211212 |
4 | 1032101000000 |
5 | 20223014424 |
6 | 2011425252 |
7 | 336250634 |
oct | 116210000 |
9 | 42540755 |
10 | 20516864 |
11 | 10643695 |
12 | 6a55228 |
13 | 4334774 |
14 | 2a20dc4 |
15 | 1c0410e |
hex | 1391000 |
20516864 has 26 divisors (see below), whose sum is σ = 41036910. Its totient is φ = 10256384.
The previous prime is 20516861. The next prime is 20516887. The reversal of 20516864 is 46861502.
It can be written as a sum of positive squares in only one way, i.e., 17305600 + 3211264 = 4160^2 + 1792^2 .
It is a Harshad number since it is a multiple of its sum of digits (32).
It is a self number, because there is not a number n which added to its sum of digits gives 20516864.
It is not an unprimeable number, because it can be changed into a prime (20516861) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1592 + ... + 6600.
Almost surely, 220516864 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20516864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20518455).
20516864 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20516864 is an frugal number, since it uses more digits than its factorization.
20516864 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5033 (or 5011 counting only the distinct ones).
The product of its (nonzero) digits is 11520, while the sum is 32.
The square root of 20516864 is about 4529.5545034804. The cubic root of 20516864 is about 273.7602107629.
The spelling of 20516864 in words is "twenty million, five hundred sixteen thousand, eight hundred sixty-four".
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