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23130320 = 245289129
BaseRepresentation
bin101100000111…
…1000011010000
31121112010211112
41120033003100
521410132240
62143432452
7400414223
oct130170320
947463745
1023130320
1112069174
1278b5728
134a3b1a5
1431015ba
15206d665
hex160f0d0

23130320 has 20 divisors (see below), whose sum is σ = 53778180. Its totient is φ = 9252096.

The previous prime is 23130287. The next prime is 23130323. The reversal of 23130320 is 2303132.

It can be written as a sum of positive squares in 2 ways, for example, as 7795264 + 15335056 = 2792^2 + 3916^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 23130295 and 23130304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23130323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144485 + ... + 144644.

It is an arithmetic number, because the mean of its divisors is an integer number (2688909).

Almost surely, 223130320 is an apocalyptic number.

23130320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23130320 is an abundant number, since it is smaller than the sum of its proper divisors (30647860).

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

23130320 is a wasteful number, since it uses less digits than its factorization.

23130320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289142 (or 289136 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 23130320 is about 4809.3991308686. The cubic root of 23130320 is about 284.9228066304.

Adding to 23130320 its reverse (2303132), we get a palindrome (25433452).

The spelling of 23130320 in words is "twenty-three million, one hundred thirty thousand, three hundred twenty".

Divisors: 1 2 4 5 8 10 16 20 40 80 289129 578258 1156516 1445645 2313032 2891290 4626064 5782580 11565160 23130320