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18530885 = 56160757
BaseRepresentation
bin100011010110…
…0001001000101
31021212110121002
41012230021011
514220442020
61501103045
7313336622
oct106541105
937773532
1018530885
11a50758a
126257a85
133aba829
142665349
151960975
hex11ac245

18530885 has 8 divisors (see below), whose sum is σ = 22601976. Its totient is φ = 14581440.

The previous prime is 18530881. The next prime is 18530887. The reversal of 18530885 is 58803581.

It can be written as a sum of positive squares in 4 ways, for example, as 58081 + 18472804 = 241^2 + 4298^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18530885 - 22 = 18530881 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 (18530881) 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, 30074 + ... + 30683.

It is an arithmetic number, because the mean of its divisors is an integer number (2825247).

Almost surely, 218530885 is an apocalyptic number.

It is an amenable number.

18530885 is a deficient number, since it is larger than the sum of its proper divisors (4071091).

18530885 is an equidigital number, since it uses as much as digits as its factorization.

18530885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60823.

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 18530885 is about 4304.7514446249. The cubic root of 18530885 is about 264.6257205876.

The spelling of 18530885 in words is "eighteen million, five hundred thirty thousand, eight hundred eighty-five".

Divisors: 1 5 61 305 60757 303785 3706177 18530885