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18203216 = 241959879
BaseRepresentation
bin100010101110…
…0001001010000
31021020211010012
41011130021100
514130000331
61450054052
7310503413
oct105341120
937224105
1018203216
11a303389
12611a328
133a04645
1425bbb7a
1518e882b
hex115c250

18203216 has 20 divisors (see below), whose sum is σ = 37125600. Its totient is φ = 8622432.

The previous prime is 18203203. The next prime is 18203239. The reversal of 18203216 is 61230281.

It is a junction number, because it is equal to n+sod(n) for n = 18203191 and 18203200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29636 + ... + 30243.

It is an arithmetic number, because the mean of its divisors is an integer number (1856280).

Almost surely, 218203216 is an apocalyptic number.

18203216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18203216 is an abundant number, since it is smaller than the sum of its proper divisors (18922384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18203216 is a wasteful number, since it uses less digits than its factorization.

18203216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59906 (or 59900 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18203216 is about 4266.5227059047. The cubic root of 18203216 is about 263.0567039325.

Adding to 18203216 its reverse (61230281), we get a palindrome (79433497).

The spelling of 18203216 in words is "eighteen million, two hundred three thousand, two hundred sixteen".

Divisors: 1 2 4 8 16 19 38 76 152 304 59879 119758 239516 479032 958064 1137701 2275402 4550804 9101608 18203216